Information Resource
for the
Duramax Diesel & 2500HD/3500 Trucks

Updated June 15, 2022

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The new Duramax 6600 light-truck diesel engine has launched General Motors into the lead in performance, fuel economy, reliability, and driveability. Since 2000, our own in-house on-road towing tests, comparing GM, Ford & Dodge, have proven GM's Duramax to be the most towing-capable diesel engine.

The Diesel Page is a membership based web magazine providing GM light-truck diesel enthusiasts with news and information designed to improve your ownership experience. Our membership program also helps each of us share a common interest and learn from each other. TheDieselPage.com will continue to have the most comprehensive collection of GM diesel editorial found anywhere.

The Duramax 6600 light-truck diesel engine is a result of a joint venture between Isuzu and General Motors Corporation (forming DMAX Ltd.). We'll have all the latest information and test reports as that information becomes available, both for the new Duramax 6600 diesel engine and the new drivetrain (including the Allison 1000 series automatic transmission). Please scroll down this page to see what information is currently available.

While many of the articles linked here are available to the public, some are reserved for subscribers. Please support our effort here, and visit this link to see how easy and inexpensive it is to become a subscribing member. You'll have access to even more diesel news, product tests and monthly feature articles devoted to the Duramax 6600 and the new GM 2500HD/3500 trucks.

New for 2022 - Duramax Diesel Service Guide

GM's 2017 6.6L L5P Duramax V-8 Turbo Diesel

TheDieselPage.com Forum is now available. Join us for more discussion about GM's Duramax diesel engine and powertrain.

Luckily, the local dealer mechanic brought to my attention a problem with the intake duct assembly on my 2001 GMC, a problem that could have significantly affected the life of the engine. The rubber portion shown in the above image had been torn during some earlier service visit. Go here to see a permanent and great looking fix.

Battery selection and tray maintenance are important to both provide the most reliable vehicle operation and to maintain the structural integrity of the battery mounting hardware. Go here to see what happens when the wrong battery is chosen, and learn how to correct the problem.

"Hey Jim, it's Blake. I wanted to let you know that the truck is officially on the road! This is nothing but a dream come true, and I still can't believe it! It runs, drives and handles flawlessly!" Blake and I had been communicating via email and by phone for some time, and I was nearly as happy as he was that the result of his effort had met his expectations. What follows is a sampling of Blake's photos and commentary that hit the high points for Blake's Duramax Diesel Conversion Project.

Imported auto parts have swamped the North American market in recent years. Some of these import parts are perfectly usable, and some not so much. In recent years, overseas non-OE manufacturers have begun producing auto replacement glass for the U.S. domestic market. This article will show you how to identify the good, the bad and the ugly.

Time, heat and a few winters of road de-icer all combine to degrade the headlight components on your truck. While my truck's original headlight lenses and lighting elements still looked like new, the various components used in the adjuster mechanisms had deteriorated due to time, heat and spray from the road de-icer used on our Montana winter roads. Go here to save money on repairs or to prevent a future failure.

Replay from 2007: Seemingly overnight, diesel drag racing has swept the nation, and is becoming more popular as each racing season passes. To help fill the need for speed, more retired Pro-Stock drag race trucks are being brought out of retirement, but not to run blown nitro burning bigblocks. Nope... The trucks are rocketing down the track with the state-of-the-art in diesel performance. Brad Makinen brought new life to a retired gas Pro-Stock truck in the form of "Dirtymax", a Duramax diesel powered Chevy 1500. This truck appeared at a drag race event I attended this past June here in Montana, which provided an opportunity to look beneath the fiberglass skin to see what it takes to make a Pro-Stock diesel run in the 8-9 second range.

Rust... Every year, millions of vehicles suffer many more millions of dollars in damage due to rust. As awful as the cosmetic damage is, rust can even make your vehicle unsafe to drive and you may not even be aware of it. I don't know of a single instance where someone dismantled their truck, sandblasted-stripped-repainted-recoated the metal parts and then reassembled everything to correct the damage caused by rust - just not worth it. What we'll do here is show you how to easily and inexpensively treat this rust problem. Now available to subscribers in the Member's Area. Not a subscriber? Visit this link to see how easy and inexpensive it is to become a subscribing and supporting member of TheDieselPage.com.

GM's 2017 6.6L L5P Duramax V-8 Turbo Diesel
GM's Next-Gen 6.6L Duramax

Beginning production in July 2000 with the 6.6L LB7 Duramax V-8 diesel engine, the current L5P 6.6L Duramax is the most recent and most powerful. Replacing the outgoing LML engine, the 2017 L5P incorporates a long list of advancements produced exclusively for General Motors' full-size heavy-duty (HD) Chevrolet and GMC pickup trucks. Go here for the specifications and all-important details.

Duramax Diesel Power Project
Rocket Science

Rocket science is a whole lot more entertaining when you actually get to drive one! The primary mission for this Duramax Diesel Power Project included proving that a Duramax 6600 diesel engine and Allison 1000 automatic transmission could be installed in a previous generation GM pickup truck, and then to explore the performance potential of the Duramax/Allison in a lightweight 4x4. Outside of General Motors, this truck was the very first Duramax diesel conversion in a pickup truck. Go here to see a series of fabulous photos of the completed truck.

Cold Weather Operation
and the GM Diesels

Updated: Operating a diesel engine during the cold winter months demands that all diesel fuel and electrical systems operate normally. Included here is list of precautionary measures and cold weather strategies that will help your diesel pickup operate reliably throughout the coming winter. If you're new to the GM diesel or any diesel light truck, the information found here should help to answer your questions as well as reduce any anxiety you might have about cold weather operation. Dealing with cold weather is really easier than you might think.

Banana Pan
Cast Aluminum Oil Pan for the Duramax 6600

Cast aluminum differential and transmission pans have been popular products among diesel owners for many years, but the engine oil pan has been largely forgotten by the aftermarket. Till now. A new lower oil pan was introduced recently for the GM Duramax 6600 by www.Go-Truck-Yourself.com. The Banana Pan was developed to allow a complete oil drain when changing the engine oil and make it easy to add an oil pan heater. The design of the stamped-steel sheet-metal OEM oil pan prevents 1 or 2 cups of old oil from draining at the time of service. The Banana Pan changes all that. Let's have a look.

Diagnostic Trouble Code P0087
LBZ/LMM Fuel-Rail Pressure Troubleshooting

While the 2006/2007 LBZ Duramax powered trucks are generally thought of by many to be the best choice when buying a used GM diesel pickup, diagnostic trouble code P0087 is emerging as the single biggest negative for the LBZ/LMM as time goes by and mileage accumulates. The OBD II explanation for this trouble code indicates that the "Fuel-Rail System Pressure is Too Low", meaning the fuel rail pressure is below what the programming expects. As the 2006-2010 LBZ and LMM Duramax engines accumulate mileage and as the fuel injection system wears, more owners of these trucks are experiencing this problem during some rather extreme and sometimes not so extreme conditions. Let's look at what is causing this problem and discuss how best to deal with it. Now available to subscribers in the Member's Area.

USDP's 2012 Dyno Day

USDP's sixth annual Dyno Day was held this past June 2, 2012 here in Missoula Montana, and the crowd just keeps getting bigger each year. From morning till late afternoon, 3 dozen of the Big Three's diesel pickups rolled across the Mustang dyno rollers and kept everyone entertained.

Regulating the Regulators
1999-2007 Power Window Regulator Service

I was buzzing the driver's side window down a short while ago in my 2001 GMC 2500HD, and I heard a gritty/grinding sound and noticed that the window wasn't moving normally. Hmmm... So, I moved the window button in the opposite direction. It was then that I heard a pop, like a pea sized chunk of gravel pinging off the windshield at highway speed. The window stopped moving, then began a slow slide downward. The window had become disconnected from the mechanism that moves the window up/down. This mechanism is called the window "regulator". Not a good start to the day. Go here to see an illustrated guide to replacing the power window regulator. Now available to subscribers in the Member's Area.

1991 Chevy K1500
Duramax Diesel Conversion

I always enjoy hearing from others who have completed or are beginning a Duramax conversion. A few months back, Jason contacted me with a few questions about his recent conversion project. Our discussion may help shed some light on a similar conversion you might be considering. Now available to subscribers in the Member's Area.

Battery Service
Power Starts Here

Own a vehicle long enough and you'll eventually have to replace the batteries. All GM 6.2/6.5/6.6 diesels came from the factory with two hi-capacity automotive batteries, wired in parallel to double the amperage capacity. This higher capacity is necessary because the 6.2/6.5/6.6 glow plug system and intake pre-heater used in the Duramax put a big load on the batteries during a cold start. And, these diesels are high compression ignition engines that require more power to crank. The combustion heat generated during the compression stroke is what ignites the diesel fuel, and a faster cranking speed increases the heat. Knowing this, it's no surprise that diesels start easier with a faster cranking speed. Let's have a look at the choices we diesel owners need to consider when buying a replacement set of batteries and look at how to prolong the life of the batteries we already own. Now available to subscribers in the Member's Area.

Diesel Fuel Quality
Solving Contamination Problems

A $4500 out-of-warranty Duramax injector replacement bill usually gets people thinking about fuel quality and its direct correlation to injector life. What we'll do here is discuss what we as diesel owners need to be aware of when buying fuel and learn how to deal with most fuel quality problems. Whether water, gasoline, sediment, or biological contamination - solving a fuel contamination problem is never any fun, but knowing with certainty what to do if it happens will provide a sense of security. Print this page and keep it in your truck's glovebox. You never know... Now available to subscribers in the Member's Area.

GM Truck
Tailgate Service

The tailgate on my truck refused to open recently due to a failure of one of the latch components. Solving the problem allowed for an indepth look at the latch and hinge components. What follows here is a step-by-step guide showing you how to service the tailgate and keep it functioning for years into the future. Servicing the latch and hinge components every year or two will keep them in fine shape and will help to prevent rust. I've neglected mine for far too long. Now available to subscribers in the Member's Area.

Grease
Eleven Steps to Success

These GM trucks have eleven grease fittings on the front-end. GM recommends greasing these eleven fittings at every oil change, which can vary from 3,000 miles to 7,500 miles, depending on how the truck is used and under what conditions. What we'll do here is suggest a type of grease and grease gun, and show you where all of the fittings are and how to grease them. Now available to subscribers in the Member's Area.

Headlight & Taillight Polishing
Renewing Plastic Lenses

It seems today that vehicles are utilizing more plastic than ever before. Care of plastics presents unique challenges that many of us are not immediately accustomed to. After finishing eight years of continuous sea duty in the U.S. Navy, I decided that now would be a good time to invest more effort in vehicle maintenance. In researching ways to improve the appearance of my Suburban's taillight assemblies, I turned to Griots Garage to assist in that goal. Follow along as we show just how easy it is to return your plastic lenses to like new condition.

The Duramax 6600 Diesel Engine
Frequently Asked Questions

It's been a few years since we updated this page, but the engine evolution hasn't been static. A number of questions are answered here that have become the most frequently asked. Such as: What was the genesis for the Duramax 6600 diesel engine, and who builds it? The Duramax has evolved through time. How many different generations now exist, how can I determine which version I have, and how are they different? What are the GVW ratings for the new 2001-2005 2500HD/3500 pickup trucks? What are the trailer weight (towing) ratings for the new 2001-2011 HD trucks? Does the Duramax really offer "class-leading" performance? When will GM produce a new diesel Suburban? These questions and more are all answered here.

Duramax 6600 Fastener Torque Specifications

More than a million Duramax powered pickups are now out of warranty. The cost of dealer service can sometimes be beyond what many owners are willing to spend, but they are willing to perform more of any required maintenance themselves. Doing the work correctly requires a proper use of hand tools, and correctly torquing the fasteners during re-assembly is absolutely vital. In addition, much of the engine is made from aluminum, which requires all of us to take precautions when re-assembling the engine to avoid stripping the threads. Stripped threads will turn a relatively routine job into a real pain. That's where a comprehensive torque specs sheet comes in. Now available to subscribers in the Member's Area.

Hydrogen Generators
Improving Diesel Fuel Economy

Hydrogen gas has been used to augment diesel fuel for many years, proving it can both extend the driving range between fillups and increase average fuel economy. Here's a hydrogen gas generator specifically developed for use as a motor fuel supplement.

A Look At 6.2L, 6.5L & Duramax Piston Clearance

Here at The Diesel Page we've not gone into much detail about engine rebuilding because the required knowledge and access to specialized equipment are beyond most of us. We've recommended you locate a local engine rebuilding center near where you live, and use them to do your diesel engine rebuilding for you. Being local allows better communication between yourself and them, and they may be more conscientious in trying to satisfy a local customer. However, it appears more individuals nowadays are getting into the rebuild process - some to save money and some to get a better result. Saving money and getting a better engine are good things. Now available to subscribers in the Member's Area.

DMAX Marks 10-Year Manufacturing Milestone

DAYTON, Ohio - DMAX Ltd., a 60-40 joint venture between General Motors Co. and Isuzu Motors Ltd., today celebrated 10 years of making award-winning diesel engines. In ceremonies attended by community and government leaders, company officials marked cumulative production of 1.2 million engines since July 2000. DMAX is the exclusive manufacturer of the award-winning Duramax diesel engine that powers Chevrolet Silverado and GMC Sierra heavy-duty pickups and Chevrolet Express and GMC Savana full size vans.

More than the sum of its parts?
The Economics of Repairing/Upgrading/Customizing

For most people, once the cost of repair exceeds ½ the current value of that vehicle, the repair cannot be economically justified. It's time to trade. On the other hand we also know that there are considerations beyond economics, and that many GM diesel owners sometimes spend more than what the economics alone would suggest is reasonable. Let's have a look at vehicle repair and upgrade costs, and from an enthusiast's point of view, illustrate some points you may not have considered. Now available to subscribers in the Member's Area.

It's Only Flat On One Side
Tips on changing a flat tire!

I remarked recently to couple of diesel owners that it had been 30+ years since a truck I was driving experienced a flat tire. How quickly it all changed recently. The spare tire had never been off the truck and I had never removed the jack and tire tools from beneath/behind the rear seat. Getting the tire changed, as it turned out, was not a big deal. Here's a step by step guide to changing a flat. Now available to subscribers in the Member's Area.

What's The Best Year Duramax?
Model Year Comparison

We get questions nearly every day from used truck shoppers asking what year Duramax is best. With the new 2011 model year arriving in mid-2010, we now have five different generations of the engine and two generations of the Allison automatic to consider. Which model year is the best buy? Which truck is most reliable, and what sort of problems have these trucks had? Which engine/transmission combination is most reliable, and which produces the best fuel economy? And finally, which model-year offers the most power? Compare them all right here. Now available to subscribers in the Member's Area.

751,837 Mile Duramax
A 2005 GMC Goes The Distance!

Imagine driving your truck 400 miles today, 400 miles tomorrow, and 400 miles every single day for the next 5 years (that's 1825 days). If you did, your Duramax would have what this truck has - more than 750,000 miles on the odometer. Do we know how long can the Duramax can last when used to tow?

2010 Duramax Suburban
What GM Should Be Building!

After creating a dozen or so essentially new Duramax powered HD Suburbans, an Ohio Duramax enthusiast recently began a 2010 Chevrolet Suburban LTZ HD project, which will be equipped with a 2010 LMM Duramax 6600 and 6-speed Allison automatic. These are the vehicles GM should be building. Now available to subscribers in the Member's Area.

2011 Chevrolet 2500HD/3500 Trucks

This past February 4th, and we learned all about GM's plans for the 2011 model year GM 2500HD/3500 series pickups. Though we're expecting a price increase of $3,000-$5,000, due to the addition of the "Diesel Exhaust Fluid" (urea) system, GM is back with a range of improvements and upgrades that promise to make GM the HD diesel truck leader. Go here for all of the new truck details.

2011 LML Duramax 6600
Engine & Emissions Tech

The 2010 emissions regulations are upon us - as well as GM. Here's an indepth look at the new 2011 LML Duramax 6600 and the new emissions equipment. How's it all work? What effect will it have on ownership? What else is new & different about the Duramax? We'll answer all these questions and more.

The Future of the Duramax
An Editorial

The chaos in the economy, the uncertain political climate and the trials GM has had these past 12 months have produced a flood of rumors on the Internet and certainly among the GM diesel community of pickup owners. Is the Duramax on borrowed time? Well.... for the time being no, but there have been a number of curious events that could cause one to believe that. This editorial discusses what I've heard, and despite the big hole in production, smart money expects the newest LML urea-equipped Duramax 6600 to appear in the 2011 model lineup. Go here for the details. Now available to subscribers in the Member's Area.

Duramax Powered Massey Ferguson Tractor

Here is a story about a Duramax Diesel powered Massey Ferguson tractor owned by Lammert ter Heide, who lives in Holland. This is not the first GM diesel to power this particular tractor. Before the Duramax, Lambert powered his Massey with a 6.2L turbo diesel. More is better, so installing a Duramax promised to take the power to a new level, and make it very competitive during the popular tractor pulls now sweeping Europe.

Room For Improvement -Part II-
Making the Dirty-Side Look Good

Member Andrew Prince wrote recently to provide information concerning how he applied some rust prevention to his new truck. As some of you may recall, The Diesel Page produced an article in 2004 entitled, "Room for Improvement", which included some shots beneath the new trucks that showed far too many rusted components. In that 2004 article, we said "A certain segment of the Duramax powered 2500HD/3500 truck buying group is comprised of enthusiasts - those who obsess to some degree over the look, ride, utility or performance of their new truck. Including myself as part of that group, I've winced at certain details of the new trucks. GM could easily rectify the situation, and this article is intended to highlight some of what I feel needs attention." While there have been a few improvements made since 2004, with regard to rust control, more needs to be done. That's what this article is about.

In-Cab Passenger Compartment Air Filter Replacement
Adding Air Flow Performance - Inside the Cab!
1999-2002 GM Full-Size Pickup Trucks

Has the cooling efficiency of your truck's air conditioning system gone down hill in recent years? Does the inside of your truck smell like wet socks when it's damp outside? If so, maybe you need to replace the in-cab "Passenger Compartment Air Filter". One of the least talked about routine maintenance items is the passenger compartment air filter. Factory installed in the 1999-2002 GM full-size pickups, the in-cab air filter(s) was designed to trap dust, pollen, and other debris that might enter through the vehicle's fresh air vent system. In addition to making the in-cab environment a more pleasant place to spend time, filtering the air also helps to keep the A/C evaporator core and heater core functioning normally. We'll show you with large and clear photos how to easily replace the in-cab air filter. Now available to subscribers in the Member's Area.

USDP's 2009 Dyno Day

USDP's third annual Dyno Day was held this past June 6, 2009 here in Missoula Montana, and the crowd just keeps getting bigger each year. From morning till late afternoon, 42 of the Big Three's diesel pickups rolled across the Mustang dyno rollers and kept everyone entertained.

GM's 2010 2500HD/3500 Trucks
2500HD/3500-Series Pickup Truck & Duramax Specifications

Pickup trucks and large sport utility vehicles have been GM's most profitable automotive segment. Pickup truck sales accounted for just 1% of the total automotive sales volume in 1959, while trucks (pickups & large SUV's) totaled 64% of GM sales in 2005. Due to their enormous popularity, pickups aren't going away anytime soon, and the Duramax Diesel will remain a big factor in driving pickup sales.

MagnaFlow Performance Exhaust Systems
Do you really need to install a performance exhaust system before adding power?
Does an aftermarket exhaust system really make a difference in dyno or towing performance?
Real-life testing is the best way to answer these questions.

Product Review: Factory exhaust systems have improved considerably though the years, with mandrel-bent 3-1/2" or 4" tubing now being the norm. You've probably read quite a few exhaust system reviews through the years, and saw the rear-wheel horsepower improvement following the installation of a performance exhaust system. The installation photos were nice and the dyno numbers usually reinforce the notion that an aftermarket exhaust system allows the engine to make more power and help to provide a safety margin when installing performance products. What's the real story?

Automotive CAN OBD2 Code Scanner
Model - T50e

Product review: Being able to read and erase trouble codes is a basic necessity these days - especially for anyone owning a GM diesel truck that is out of warranty. Even if your truck is still covered by the factory powertrain warranty, knowing what that "service engine soon" light means and how serious the problem might be can help you when scheduling service or can help you gain some insight into what the problem might be. The inexpensive T50e can can help you save money on vehicle maintenance.

BD - Diesel Performance
Spring 2008 Dyno Day

After a long winter here in the Northwest U.S., most diesel pickup owners are ready for a trip to the Southwest - Southwest Canada to be precise, the home of BD Diesel Performance and their semi-annual Dyno Day. Despite the gray skies, hundreds of diesel enthusiasts made their way to Abbotsford, British Columbia last spring on April 5th, and a total of sixty trucks spun the rollers from early morning through late afternoon. If you like power, this was a great way to spend a day, to both learn more about diesel performance and have an opportunity to see trucks push the Mustang dyno to nearly 1000-hp.

1987 Chevy C30
Duramax Diesel Conversion - In Progress

Bringing new life to an older truck is more than just a way to save a ton of money. A surprising number of members keep the same vehicle for decades, and want to do all they can to keep it on the road. Converting the drivetrain to Duramax/Allison power has become a popular upgrade for the GM fans, which increases the vehicle's capability. Member Kean Clark is currently working his way through a 1987 Chevy C30 restoration and Duramax conversion project, and we wanted to share his progress with the GM community.

Diesel-Rated Motor Oil
Synthetic/Conventional - Which is Best?
Important Facts About Motor Oil

The question of whether we should be using synthetic diesel motor oil in our GM diesel engines has been a popular subject for a long time. Synthetic oil has some definite advantages over the available conventional motor oils, but are there any measurable benefits that justify the added expense? Find out here! Now available to subscribers in the Member's Area.

Allison 1000
Annotated Diagnostic Trouble Code List

This annotated Diagnostic Trouble Code (DTC) list is specific to the Allison 1000 automatic transmission. Being armed with a good basic knowledge about the Allison trouble codes can help to ensure a better level of service if you have an in-warranty truck or can save you a lot of money if your truck is now out of warranty. Now available to subscribers in the Member's Area.

2001-2008 Duramax Diesel
Annotated Diagnostic Trouble Code List

This annotated Diagnostic Trouble Code (DTC) list contains all of the Duramax diesel engine-specific trouble codes relating to the engine. We've learned through the years that while a typical GM service technician may understand gas engines and their related powertrains quite well, a talented diesel mechanic is much harder to find. Being armed with a good basic knowledge about the diesel systems incorporated into your truck can help to ensure a better level of service if you have an in-warranty truck or can save you a lot of money if your truck is now out of warranty. Want to know what the codes are, what they mean, how to retrieve them and know how to repair the problem? Now available to subscribers in the Member's Area.

Duramax - Mass Air-Flow Sensor
Troubleshooting & Maintenance

Back about the time the auto makers began using electronic fuel injection, they discovered that for the onboard computer to correctly calculate the fuel/air ratio, they needed to measure the incoming air flow to the engine. Electronic fuel injection not only allowed the engine to run more efficiently and to produce better fuel economy and drive-ability, but MAF sensor data also allowed the computer to help protect the engine if the ratio of fuel to air fell outside of normal. The Duramax diesel also employs a MAF sensor, which is used to measure the grams/second of air entering the engine's intake system. Now available to subscribers in the Member's Area.

Duramax Diesel
Accelerator Pedal Position Tech & Troubleshooting

The 2001 model-year and newer GM Duramax diesels were all equipped with the "drive-by-wire" Bosch high-pressure common-rail electronic fuel injection system. While the Accelerator Pedal Position (APP) module has performed reliably through the years, the first Duramax equipped trucks are now more than 8 years old, and knowing how the APP operates and how to troubleshoot a problem could be a huge help in the future. Thirteen diagnostic trouble codes are discussed, and we'll walk you through the troubleshooting process. Now available to subscribers in the Member's Area.

4.5L V-8 Duramax
GM's Suburban Goes Diesel

Those of us who have been following GM's on-again off-again diesel Suburban program over the past eight years were beginning to lose faith whether we would ever see a production version. The wait may be coming to an end as GM unveiled its proposed 4.5L Duramax powered Suburban to an enthusiastic crowd during last fall's annual SEMA show. The most recent news we have is that GM will begin production of the 4.5L V-8 sometime in the second half of 2009 (as a 2010 model year), and will introduce this new engine in a variety of full-size vehicles, including the popular Suburban. Go here for more engine details. Now available to subscribers in the Member's Area.

Extend Oil Life & Engine Life
Amsoil Dual Bypass Oil Filtration

Product Review: A dual-bypass oil filtration system and synthetic motor oil can extend drain intervals by at least 8 times when compared to conventional oil and filters, and can extend the life of your engine. Follow along as we show you how to install Amsoil's Dual By-Pass oil filteration system and show you the analytical results of cleaner oil.

Save Diesel!
GM's Locking Diesel Fuel Cap

All those who haven't been living under a rock have probably noticed that the cost of diesel fuel has risen to the "Arm & Leg" level at your neighborhood fuel station. You have to know that the "five finger discounters" have also noticed. Save money on your fuel costs by buying a genuine diesel locking fuel cap directly from your local GM dealer. Go here for the installation instructions. Now available to subscribers in the Member's Area.

AirLift Air Springs
Leveling the Load
For the 1992-2008 GM Trucks & Suburbans

Like many of you who use your diesel pickup truck or Suburban to tow trailers or haul heavy loads, I use my Suburban to tow a 30 foot travel trailer that tips the scales at a hefty 8500#. Over time, this has caused the rear springs on my 3/4 ton Suburban to relax so that the rear now sits lower than the front even while unloaded. With models available to fit all 6.5L or Duramax powered pickup trucks and Suburbans, I eventually settled on the AirLift adjustable air springs as being the best solution to this problem. Follow along as we take you through the kit introduction, installation and show how the air springs solved the problem. Available to subscribers now in the Member's Area.

2001-2004 Duramax Diesel
Excessive Fuel Return Flow & Related DTCs
P0089 - P0093 - P1093

The Diagnostic Trouble Code P0093 applies to the 2001 model-year Duramax. This trouble code was updated for the 2002-2004 model year engines, and received a new number - P1093. Each refers to the same problem. P0093 & P1093 are defined as "Fuel System Large Leak Detected", which could mean that one or more injectors are experiencing a high fuel-return flow rate. People usually start looking beneath the truck for signs of fuel, but this isn't that kind of a leak. Let's have a look at these, and other related trouble codes, to provide a little more insight into what they mean and how to deal with them. Available to subscribers now in the Member's Area.

2001-2007 2500HD/3500
NVG-261/263
Transfer Case Leak Prevention

Product Review: For several years now, we've been hearing reports of transfer case fluid leaks due to a wear-through on the rear case half. If not caught before a leak develops, the transfer case could suffer complete failure due to a lack of lubrication. The most reliable solution includes installing an aftermarket part that prevents a case wear-through from happening. Follow along as we show you the problem and describe what it takes to produce a permanent solution.

Chevy -Vs- Ford
Tow testing the new emissions LMM Duramax and 6.4L Powerstroke

A recent pickup truck ad I saw on television said: "Truck guys will tell you taking off with 10,000-lbs ain't no picnic. Stopping 10,000-lbs ain't no picnic either." We agree. Towing tests are few and far between in the automotive media. Most of what we see are dyno results, 1/4-mile elapsed times, and generalized reports about on-road capability. Those types of tests can provide some clue about what we might expect to see while towing a heavy trailer, but they fall short of a real towing evaluation. Part of what most potential GM & Ford buyers really want to know is how the newest diesel pickups stack up against one another in a real-world towing test on a real hill while towing a trailer that weighs at least 10,000-lbs. That's what this test was all about.

4.5-liter V-8 Turbo-Diesel
GM's new light-duty Duramax

General Motors announces an all-new 4.5-liter V-8 Duramax high-output diesel engine for the Chevrolet Silverado and GMC Sierra light-duty pickup trucks and the HUMMER H2. The engine fuel efficiency offers a 25 percent advantage compared with gasoline engines. Environmental benefits of the new engine include a 13-percent reduction in CO2 versus gasoline engines, and at least a 90-percent reduction in particulates and NOx when compared to diesel vehicles today. GM-Media News Release

1 Million Duramax 6600 Diesel Engines

After six years and nine months of continuous production, DMAX Ltd., the maker of the Duramax 6600, celebrated producing its 1,000,000th engine on April 16, 2007. According to DMAX, they can sell all of the engines they produce and more. Go here to see the story and learn more about what makes the Duramax 6600 so successful.

2007i Duramax LMM
The New Emissions System

The new VIN code 6 2007i LMM Duramax equipped trucks have arrived, and along with them the new DOC/DPF (Diesel Oxidation Converter/Diesel Particulate Filter). Changes in the emissions system are the big news, and this article should help to explain what's new & different and shine a light on what LMM owners need to know to have the fewest problems. Go here to see original photos of the new emissions components, and learn how these components function. Do we need to worry about the 2007 emissions systems? Available now in the Member's Area.

2006 Mirror Upgrade
Easy upgrade to GM's 2006 Mirrors

I recently upgraded the stock mirrors on my 2005 GMC 2500HD to the 2006 model trailer towing mirrors. Although the stock mirrors extended for trailer towing, I was not happy with the narrow field of view the stock mirrors provided. For the 2006 model year, GM released a new style extendable towing mirror, similar to the Ford SD towing mirrors. Go here for a photo-illustrated step-by-step guide to installation. Available now in the Member's Area.

Duramax & 2500HD/3500 Truck
Technical Service Bulletins

Here, you'll find 43 of the top GM Technical Service Bulletins pertaining to these trucks and the Duramax/Allison drivetrain. Included are the bulletin number, the title and a summary for all 43 listed bulletins. This compilation contains great information you need to know. Available now in the Member's Area.

2006 Duramax LLY/LBZ Technical Service Bulletin
No Engine Crank and No Tech II Scan-Tool Communication with TCM

Going all the way back to 2000, GM has admonished technicians and vehicle owners not to allow the metal-cased ECM (Engine Control Module) and TCM (Transmission Control Module) to be used as a grounding location that could subject the electrical system to excessive electrical current. Find out what happens when this occurs. Available now in the Member's Area.

2007 Duramax 6600
& Vehicle Applications

Designed to meet the 2007 emissions regulations, the 2007 LMM Duramax 6600 diesel engines have met the challenge, and continue to lead in power & torque. More power and torque are the good news. Go here to learn all of the details about the new engine and its application.

SEMA Trucks
Go Big or Go Home!

Trucks at SEMA were there to attract attention - and boy did they! Each of the 2100+ Vendors and manufacturers who attend the annual Specialty Equipment Market Association event needed something special to lure some of the 100,000+ passers-by (and the media) into their booth. Having an eye catching truck helps them do just that, and this year was no exception. Here is a collection of GM, Ford & Dodge (and Toyota) trucks I thought stood out in some way from the others at SEMA 2006. Have a look!

ATS Allison Extreme
Performance-Built Transmissions

Product Review: The Allison 1000-Series 5/6-speed transmissions are simply the best and most durable automatics to ever have been installed in a pickup truck. When using stock power, it's practically impossible to hurt the transmission or exceed its torque handling capability. As good as the Allison is, however, it's still possible to exceed its torque handling capability when using a power adder. Most Allisons will hang onto at least 75 additional horsepower and 200 lb-ft of torque, but living on the ragged edge can take a toll on long-term durability. This is why installing a performance-built Allison can increase the fun!

Reducing emissions components found in diesel exhaust is not without its share of engineering challenges and increased cost. While some fear for the future of the light-truck diesel market, we here at The Diesel Page remain optimistic - in fact, confident that the current trend in light-truck diesel usage will continue. Go here to find out what we'll need to know and how the new fuel and emissions requirements will affect all of us.

GM has a lot riding on the 2007 model year. With nearly 50% of all new vehicles sold in the U.S. being pickup trucks, this market is something General Motors simply has to do well in. Introduced as a 1999 model, the outgoing Silverado is now eight model years old, and has begun losing ground to the fresh faces offered by both foreign and domestic competitors. Enter the GMT-900, a new for 2007 body style that introduces a long list of refinements in addition to all new sheet metal. Included here are new photos and information about the new 1500 series trucks, and we'll discuss how the design features shown here could appear in the upcoming 2500HD/3500.

A looming grade can either induce dread or anticipation; depending on whether you're driving the highest rated diesel pickup the "big three" have to offer. Included here is an accounting of the 12 trucks that pulled the hill this year, which included 4- Duramax's, 4- Powerstrokes, 2- Dodge Cummins, and 2- 6.5TD's. Find out what truck is the King of the Hill.

After considering all the various cold air intakes systems available for my truck, I decided to develop my own, which only cost a few dollars and an hour or so to complete. Keeping the intake air as cool as possible improves power and may improve fuel economy. While inexpensive, this modification retains the excellent filtering ability of the stock air intake system.

Product review: Last month we showed you how to update the 2001-2004 LB7 Duramax ECM with one programmed for more power & better fuel economy. This month, we look at the 2004.5-2005 LLY Duramax ECM.

Product Review: The various electronic power products have done a remarkable job of increasing Duramax diesel performance, but till now, we've had to accept whatever programming or tuning options were offered by the aftermarket. The recent appearance of custom ECM (Engine Control Module) programming has increased the number of options for nearly every truck owner, whether they're looking for a few more miles per gallon, a safe towing program or a killer track tune. Kennedy Diesel is now offering custom ECM tuning, which provides for a host of additional programming features.

There are two schools of thought regarding performance product development for the diesel market. One is the shotgun approach, where you make an intuitive guess about what method or design would improve performance - first trying one approach then another, hoping to achieve a performance improvement. The second approach is where a design is taken from the theoretical to production, which achieves the performance goals set by the client. This is the realm of engineers - light truck diesel engineers in particular. I spent some time recently with the folks at BD - Diesel Performance in BC Canada, and learned more of what it takes to correctly design a range of products that really do improve performance - the right way.

In an effort to reduce cold-start induced white smoke, GM has upgraded the glow plugs, the glow plug controller and the ECM programming on a continuing basis since first introducing the first Duramax 6600 in the fall of 2000. The 2006 Duramax, identified as either RPO code LLY (early '06 models) or LBZ (late '06 models), saw another glow system upgrade. Faster-acting glow plugs and shorter cycle times combine to further reduce white smoke after a cold start, while helping to make diesel engine operation more transparent to those more familiar with starting a gas engine. However, there have been a few bumps in the road regarding the 2006 glow system.

The NEW Duramax 6600 1999-2004 bound volume is now available! The Duramax 6600 - 1999-2004 volume contains every important feature article, product review and tech article that appeared here in The Diesel Page from 1999 through early 2004. Written by enthusiasts for enthusiasts, this is the most comprehensive collection of Chevy/GMC Duramax 6600 and vehicle related information available to truck owners. All totaled, there are 43 articles in 189 information packed pages, and illustrated with 290 photos.

Your truck is fast, but just how fast is it? Or, maybe you've added some performance equipment, and can't really tell whether the additions (and the costs involved) made a difference. Chassis dynamometers and 1/4-mile tracks can be used to accurately measure vehicle performance, but for most of us, getting to a track or dyno can be both expensive and oh so inconvenient. That's the beauty of the G-tech. Relatively inexpensive, yet accurate, performance meters like the G-tech Pro RR featured here allow you to test and tune at any safe and convenient location and as often as you'd like. The G-Tech Pro is the latest rendition of performance meters manufactured by Telsa Electronics, Inc. Let's have a look at what the G-tech can do for you. Available now in the Member's Area.

Fuel Quality can determine whether your diesel fuel injection system provides typical service or whether you are plagued with frequent visits to the dealership. GM recently upgraded the factory fuel filter element in an effort to help protect the Bosch high-pressure common-rail fuel injection system used by the Duramax 6600. Trapping more and smaller particles in the fuel can improve both fuel quality and injection system longevity. Lubrication Specialist Greg Landuyt has developed an easy to install and cost effective auxiliary fuel filter kit that can add a significant safety margin to the diesel fuel you're using.

Product Review: As diesel fuel injection systems become more complex and more sensitive to fuel quality, owners have become more tuned-in to the nature of diesel fuel systems. Being able to check fuel pressure (vacuum) can help an owner diagnose a future problem or allow him to monitor the condition of the fuel filter in an on-going basis. This not only can save you a lot of frustration in the high-stakes game of vehicle service, but can save you money on fuel filters by not replacing them till the fuel restriction gauge tells you it's time.

Product Review: There's an old saying that says "offer a great $5 part that installs in 5 minutes, and you'll sell a million of them." Well, the KD boost valve might be a little more than $5, but it is still inexpensive, installs in minutes, and offers a lot of bang for the buck. This simple device increases maximum boost pressure about ~5-8 psi, and makes the factory LB7 turbo a lot more responsive under all operating conditions. Combine this with any one of a variety of Duramax power mods, and you'll see an even bigger improvement in power than what a power mod by itself delivers.

The third annual Edge Products' "Weekend on the Edge" event was held near Salt Lake City, Utah this past September. For anyone who loves diesel engines, fast trucks and big-big power, this was a weekend you didn't want to miss. Click the above link to read more about it.

We hear of Allison fluid leaks every once in a while, and have recently experienced one ourselves. Most of these leaks result in automatic transmission fluid dripping off the bellhousing area of the transmission. An input shaft seal problem probably comes to mind first, but as we've learned, these seals are rarely the cause. Follow along we show you what to look for and how to repair a leaky Allison. Available now in the Member's Area.

The 2006 model-year Chevy & GMC diesel pickups began arriving on dealer lots in August of this year. While not much has been added or changed to the pickup styling or option list, the big news is the new RPO code LBZ Duramax 6600 diesel engine. Go here for a look at the new trucks and to learn more about the new uprated Duramax diesel engine.

Making big power these days requires help to burn all of the fuel provided by the power modules and programs used in competition, and nitrous helps burn that fuel and make more power. If you're after the most Duramax diesel performance, all roads lead to nitrous oxide.

The number of different gauges and gauge accessories has grown considerably since our 2002 gauge install piece. I recently stopped by to see the folks at USDieselParts.com, and got acquainted with what's new for those looking for gauges and gauge accessories. Let's have a look.

Measuring engine and drivetrain performance on a real hill and with a real load is in essence what a Pull-Off is all about. Each Pull-Off has two primary objectives: 1- To learn how stock diesel pickup performance evolves with each new model year, and 2- Track the performance improvements made possible by the aftermarket. The Pull-Off is simply the best way to measure the towing performance of a diesel pickup truck. What's it take for a modified truck to rule the hill? Click the above link to learn more!

Tire size is a proportional feature that plays into how we perceive the appearance of a pickup truck. Most agree the factory tire size for the 2500HD of 245/75R16 has always appeared to be too small. Nearly all agree - except that is, for GM.

A bright yellow Service Engine Soon or Message Center warning usually means trouble. Luckily, this "Service 4WD" Message Center warning light often means you'll just need to replace the pushbutton switch panel that controls the NV-263 selectable-shift transfer case (RPO code NP1). Go here to find out how. Available now in the Member's Area.

Banks Big Head
More Boost for the LB7 Duramax 6600

The key ingredients to more turbodiesel power are more fuel and higher boost pressures. The Banks Big Head incorporates an adjustable turbo wastegate linkage, allowing you to raise boost pressure to get that power increase.

Performance Tuning/Flash Programmer Roundup
Press "YES" for More Power!

Performance tuning/flash programmers appear to be carving out a market with the Duramax performance crowd - and for good reason. Programmers offer a number of unique features that make them a "must have" for any Duramax owner. Here is a brief summary of five Duramax power programmers, and a list of features available for your Duramax.

Performance Traction Bar System

Product review: Big power can stress unmodified chassis and suspension components in ways that limit overall truck performance. Pushing ¼-mile times into the 13's is relatively easy. Going faster requires more power, more effort and more attention to chassis setup. The recent installation of Kennedy Diesel's traction bar system in our Duramax Diesel hot-rod is a step toward the 11's. Available now in the Member's Area.

We're always looking forward to the mid-year announcements of the upcoming model lineup for GM's 2500HD/3500 pickup trucks. Evolutionary changes to both the exterior appearance and to mechanical/electrical systems enhance function and help improve ownership satisfaction, and the 2005 models continue that tradition. While we tend to focus on the 2500HD/3500 models, you'll find the powertrain specs for the gas engine equipped trucks here as well as those powered by the Duramax diesel.

Introduced in January of 2004, the RPO code LLY Duramax 6600 incorporates a number of significant technology changes. Two forces control diesel engine evolution for all engine manufacturers - Emissions compliance and market share. The technology changes introduced with the LLY address both of these forces. Creating an engine with more power and lower emissions has become more challenging, but that's exactly what the LLY delivers.

Product Review: You hold in your hands one of the most remarkable power upgrades available... So begins Edge's product description on the back of the box. After having spent some time with the new Juice/Attitude, I tend to agree. In addition to the 5-level 0-150 horsepower increase (depending on model) available at just the touch of a button, the Edge Juice with Attitude monitor combine to produce a truly comprehensive engine performance package for the Duramax diesel.

Product Review: Squeezing the last bit of performance out of a turbo diesel involves improving exhaust flow and intake airflow. Performance air intake systems are the best way to help your engine breathe, and AFE produces a line of products to help achieve maximum intake air flow. Documenting performance improvements using a chassis dyno helps answer many questions, and we thought you might be interested to learn what we discovered after installing an AFE Stage II performance air intake system on our 2001 GMC 2500HD equipped with the Duramax/Allison.

General Motors has extended the Duramax 6600 fuel injector warranty coverage for owners of all 2001 through 2004 model-year Chevrolet and GMC Duramax 6600 equipped pickup trucks. Go here to read all about it.

Product Review: General Motors' 6.6L Duramax turbocharged diesel engine was introduced in the 2001 model year 2500HD/3500 pickup trucks and chassis cabs. Along with the new engine came the Bosch high-pressure common-rail fuel injection system. Fuel pressures as high as 23,000-psi demand much from the high-pressure pump and solenoid-controlled fuel injectors, and the less than stellar quality and cleanliness of the available diesel fuel here in the US may present some durability and longevity challenges for these components. Supplemental fuel filtration may be required.

Product Review: Today's performance air filters must excel at two vitally important and yet polar opposite functions. First, they must allow the engine to breathe without unnecessarily restricting airflow. Second, today's performance air filter is also judged by its dirt capturing ability. Truck owners in the know demand an air filter that allows an engine to perform up to its full potential yet stops virtually 100% of all harmful dust and other airborne contaminants. Creating the perfect blend of unrestricted airflow and maximum dirt stopping ability is the goal of today's performance air filter manufacturers.

Chevrolet's flagship SUV just got a significant boost in power and capability. Effortless towing and the potential for 20+ miles per gallon make this arguably the single best Suburban ever... Available now in the Member's Area.

Sometimes you don't know what you've been missing in your truck's ride quality till you install a new set of shocks. The factory-installed shocks had just 28,000 miles on them, and given the fact that this is a 9200-lb GVW pickup truck, I thought the original shocks were doing an OK job. Installing a new set of Bilstein shocks let me know what I was missing.

Duramax Diesel Power Tour   Exclusive interview with the Power Tour. 2001 Duramax 6600 GMC C3500 on the road!

Duramax 6600, First Look   See the new Duramax diesel engine and Allison transmission.

Duramax 6600, The New GM Diesel Trucks   Our "Ride & Drive" impressions of the new Duramax diesel trucks. October 1999.

Power Specifications for the Duramax 6600 12/14/99

Many Duramax/Allison related articles are now available to members of The Diesel Page in the Member's Area Duramax Page.

GM announced a voluntary customer satisfaction program (#05546) for current owners of Duramax diesel equipped vehicles. In a letter dated August 2005, current registered owners were informed that they are eligible for one free fuel filter replacement, and GM has instructed their dealer network to perform this service free of charge through September 30, 2006. Please contact your local dealer to learn more about this free offer, or call 1-888-996-9463 if you need more information.

2006 Duramax 6600 Turbodiesel specifications

GM unveils pickup truck with 5th door More news, 1/11/2000

New Duramax Diesel 6600 to Help GM Heavy-Duty Pickups and Chassis-Cabs Set New Industry Benchmarks in 2001 Model Year. 12/20/99

Chevy plans 2 new trucks GM News Release 12/8/99