We are diesel engine, powertrain and chassis experts and are here to help you achieve optimum performance and longevity from your truck.

You've spent your hard earned money on the Duramax Diesel option in one of the most popular and well engineered trucks there is, now don't you think you owe it to yourself to use the very best oil in it? And don't let your local dealership service center tell you that you you have to use their brand of oil to "maintain your warranty". That is one of the biggest untruths we have heard yet it goes on day in and day out. We constantly receive calls from customers that were told this by their servicing dealership. This practice is not authorized or condoned by the auto manufacturers, but the fact is it still goes on.

How a servicing dealership can essentially tell a customer that they have to use a lower quality oil to "maintain their warranty" is not only wrong but it is also illegal unless they provide it free of charge. There are Federal laws that protect you against this. Please read our Warranty Laws You Need to Know section of this website to learn more.

Specifically for the Duramax Diesel AMSOIL engineers and manufactures a 15W-40 Synthetic Heavy Duty Diesel and Marine Motor Oil (as well as Series 3000 5W-30 Heavy Duty Diesel Synthetic) that when used in conjunction with the AMSOIL Eao-52 engine oil filter will allow you to travel 25,000 miles/1-year between filter changes and 25,000 miles/1-year between oil changes for normal duty service  If you use oil analysis you can usually go longer than 25,000 miles. Other AMSOIL benefits include reduced sludge and deposit formation, extreme temperature protection, improved fuel efficiency and rust and corrosion prevention and it does not void any new vehicle warranty. AMSOIL Synthetic Lubricants meet and exceed all API rated and GM specifications.

Superior Shear Stability and Extended Drain Intervals in Ultra-Low Emission Diesel Engines. AMSOIL Synthetic 15W-40 Diesel Oil (DME) is the premium choice for API CJ-4 emission-quality diesel oil required by model-year 2007 and newer diesel engines.

The other option is to install an AMSOIL Dual Remote By-Pass Filtration System.  With this system you only change your oil when oil analysis indicates.  The AMSOIL Ea full flow filter is changed at 25,000 mile intervals and the by-pass filter is changed at approximately 25,000 miles for normal duty service.   The AMSOIL 15W-40 Synthetic Heavy Duty Oil  or the Series 3000 5W-30 HDD does not break down like conventional petroleum based motor oils, is much more shear stable and does not have the waxes, paraffins and by-products that come out of crude oil that is pumped from the earth.

Your average regular full flow engine oil filter will only remove wear particles down to the 20-25 micron range.  The filter cannot remove finer particles because the oil must be filtered quickly while removing most of the particles present in the oil, except the particles below the 20 micron range.  A study completed by Federal Mogul Corp. analyzing over 7000 main and connecting rod bearings concluded that 60% of all engine wear occurs in the 5-20 micron range.  This is why no matter how much you change your current full flow oil and filter, regardless of brand, that you still are not removing the particles that cause the greatest wear in your engine.

If you choose not to install the Dual Remote by-pass filtration system then the AMSOIL Ea Oil Filter would be of a significant benefit to the long term durability of your engine as well as allowing for 25,000 miles of service on the filter and 25,000 miles/1-year on the oil.

Ea Oil Filters feature advanced full synthetic nanofiber technology, making them the highest efficiency filters that are available for the auto/light truck market. They have an absolute efficiency rating of 98.7% at 15 microns and 50% at 7 microns.

Note: If you use an oil filter other than AMSOIL, change the oil filter at the manufacturers recommendations (usually 5,000 miles).

One of the Power Stroke Diesels in our dealer group has over 84,000 miles on the same oil as of November 2003. Laboratory oil chemical analysis every 15-20,000 miles indicates the oil is perfectly suitable for continued service. Other customers have traveled well over 100,000 miles and oil analysis still indicates no oil change necessary. We will mail you a copy of this vehicle's oil analysis results with your product and technical information package so you can see the data for yourself. In addition, the AMSOIL By-Pass filter will also remove up to a pint of water from your vehicle's lubrication system, which is especially important in a diesel engine. Without this the water promotes rust, corrosion and rapid wear. Internal engine heat also creates acids which also wear the engine components. The water and acids build and continue to work destroying your engine even after engine shutdown.

AMSOIL has a complete line of synthetic motor oils, greases, transmission fluids, gear lubes, Two-Stage foam air filters, by-pass and full flow filters and filtration systems designed to extend the life of your vehicles and equipment and save you time and money. In addition we also offer a preferred customer wholesale purchase option, retail purchase option or commercial account purchase option for businesses. We also offer a Dealership Option for anyone interested in becoming an AMSOIL Dealer and/or purchasing products at wholesale cost.

Take a look at the varnish deposits in this picture. These are the results of a severe high temperature deposit test.  The one at the far right is AMSOIL Synthetic 15W-40 Diesel oil and the others are major brand petroleum diesel oils. (left to right: Chevron Delo 400, Cummins Premium Blue, Shell Rotella T, AMSOIL 15W-40). The test clearly shows that AMSOIL keeps engines cleaner longer than other major brand diesel oils do. Which oil would you rather have protecting your engine?
 

The bottom line: To prevent or eliminate turbocharger bearing seizure, there is no substitute for a high quality synthetic diesel oil (like AMSOIL's) as they have been have been proven to maintain turbochargers in an almost "as fitted" condition and significantly reduce deposit formation.

We are here to help you learn the facts and show you how you can use AMSOIL and get a superior product and also increase the performance and add to the longevity of your Duramax Diesel plus save time and money. Duramax Diesel trucks are excellent vehicles and exceptionally well engineered by General Motors. In our opinion they are one of the most advanced vehicles ever produced, however there are ways to make the performance and longevity even better with AMSOIL Synthetic Lubricants.

We have an article of an AMSOIL user with 731,000 miles on his 1993 Ford Aerostar on the original engine and transmission. He was using AMSOIL from the beginning. This type of mileage is not uncommon when using AMSOIL synthetic lubricants.