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AMSOIL Motor Oil, interval and Filter Recommendation For GMC and Duramax Turbo Diesel Trucks

AMSOIL improves operation of your GMC Diesel engines. No longer settle for what 'they' want you to use.

GMC Turbo Diesel Owners Can Reduce Costs and Improve Performance

Duramax Bypass Kits (BMK-27) in stock! We ship these at the lowest price! When you order online it goes through the AMSOIL portal. By calling I can ship from our warehouse saving you money and the tax on all AMSOIL products. The Duramax customer base is strong here. Try the Bypass kit, the CJ4 5W40 and our Diesel Concentrate Additive. More below>> But mark down our phone # 1-800-579-0580.


For Classic and pre 2007 diesels choose AMSOIL AME 15W40, HDD 5W30 - both increase MPG 3% to 8% (CI4+ rated recommended for 2007 and earlier) or any of our new CJ4 oils.

For the 2007 non-Classic and newer choose from AMSOIL CJ4 rated 100% Synthetic Oil - AMSOIL DEO 5W40, DME 15W40.
Or the lower cost OED for OEM intervals. (call to be amazed how low our price is)

2007 and Up - Please Read!
Amsoil Tech Service Bulletin - OEM Interval Recommendation
Subject: Fuel dilution issues in 2007 – 2010 light-duty turbo-diesel pickups requiring CJ4 Rated Diesel Oils.

Oil Analysis Kits for extending intervals (Warranty Secure) on diesels with DPF systems.

The #1 comment is regarding the improved mileage and smoother engine performance. AMSOIL is the only synthetic diesel oil designed for extended intervals which can resist the added sheer caused by new diesel emissions systems which increase soot, heat, foaming and rust.. Find out why people have trusted AMSOIL Diesel oils since added to the line in 1976.

Reach 25,000 miles or more before changing engine oil. You don't have to go that long, but AMSOIL knows the product (AME 15W40) will neutralize soot and acids, retain its viscosity, resist sheer and reduce oil temperatures in turbo and non-turbocharged diesel engines for that duration under normal service and 15,000 miles under severe service.

Look up your vehicle's filters, capacities, plugs, wires, wipers and Transmission/Drivetrain Fluids.

New - More fuel mileage AMSOIL Low Viscosity Transmission Fluid replaces DEXRON VI. (See AMSOIL ATL)>
Older units use AMSOIL ATF (MultiVehicle)
For Allison calling for TES-295, Torque-Drive Transmission Fluid is a match for These transmissions requiring THERMAL AND OXIDATIVE STABILITY. Find out more on the AMSOIL ATD with the technical data bulletin.
For Manual, GM Automatic transmissions and differentials we have the best fluids with better performance. Third party reports show AMSOIL was the choice to eliminate transmission failures totally - when using the AMSOIL ATF (Replaces Dextron lines of fluid)

The most abuse occurs in your differential! Nothing comes close to AMSOIL Severe Gear 75W90, 110 or 140WT. 100,000 mile protection - saves up to 5% in fuel under load too!

Bypass Oil Filter Kits

Three styles are available for your Duramax.
Duramax 6.6 Bypass (partial flow - parasitic) filtration kit shown (BMK-27)
A REAL Soot Elimination Device.
For GM Diesels order the BMK-27 KIT - Comes with everything but the sampling valve.

Scheduled maintenance does not prevent serious problems. Superior lubrication and filtration does. Amsoil bypass kits protect your engine while oil analysis alerts you of potential issues allowing you to save time and materials. Changing your oil everyday would not function to prevent the failures that happen in the real world.
Just as it's been discovered in the industrial and manufacturing world, Amsoil has millions of miles of data compiled over 35 years to know that lubrication change intervals based oil analysis is the most efficient. Analysis also protects you under warranty as does our guaranteed service intervals. Please ask about our post paid kits (KIT-02) See where your oil stands.

The Bypass kits come with a free Analysis (included as a voucher)

Fall 2012 Special - Use our single kit below (BMK-21 with sandwich adapter) and send us back photos of your install and I will rebate back to you $20 for your purchase with us. Call 800-579-0580 to order.

Note: If you buy the Single mount Bypass kit our BMK-21 offers you the most user friendly results with our new sandwich adapter (Part# BK-1201) which is specifically designed for your truck (Duramax only) and has a port to easily feed our bypass kit unit then a return to your pan or oil fill cap (also billet part #BK-1202 and elbow BP-242). Here is the display with the above parts. Look closely:

The unit below the filter on the right is the sandwich adapter to simplify the instal. You thus have our EAO-52 full flow 15 micron filter and the 2-micron bypass filter.
Single set-up for GM 6.6 diesel. Easier set-up and same filtration as dual unit (full flow stays on the engine for this get-up)

We feel the best contribution AMSOIL has to your diesel next to our engine oils is our improved fuel additives for ULSD Fuel. You need to return the lubricants and additives removed by ULSD. The new AMSOIL ADF improves mileage enough to pay for the product as verified and tested over 12.5 million miles.
Please review these additives and the Q&A section on the Diesel Fuel Additives page.


BYPASS Filter Dual Remote Kit

For All Duramax owners we now have everything in a box which covers the entire install. The BMK-27 unit. Please call 800-579-0580 for details. Here is the full instruction page included in the kit Duramax BMK-27 kit.

NANOFIBER Cone Aftermarket Air Filter

1994 to 1999 - Engine uses 7.1 quarts with filter. In 2000+ use 10 quarts.

Now, AMSOIL AME 15W40 is rated for the Chevrolet Duramax Turbodiesel for drain intervals 25,000 miles or one year. The new Absolute Efficiency EAO-52 oil filter is also rated for 25,000 miles or one year so it's simple.
For severe service (heavy constant towing, truck used for short drives or trucks with over 100,000 miles) use a 1-year or 15,000 mile drain interval.

New Nanotechnology Air Filter for the Duramax:
The new Absolute Efficiency Air Filters vary per year so please call so we can match. These are washable, require no oils, meet OEM requirements and are guaranteed to last 100,000 miles or 4-years. These cost much less per use and save you the trouble of bad fit or the need to add any type of oil. They are made to AMSOIL's requirements licensed by Donaldson using the new NanoFiber technology.

Use our Online Application Guide to match your filters and to list all the choices you have for fluids in your truck.

We strongly recommend you review this article from Al Amatuzio (CEO of AMSOIL) regarding the AMSOIL Donaldson partnership and the quality of this company.

Increase economy even more using the new AMSOIL Severe Gear 75W90 or 75W140 which has a interval of 100,000 miles.

You may also want to test your oil before and after switching to AMSOIL to fully understand the superiority of our products. Using our analysis kits will give you the piece of mind you deserve and is a more responsible method to monitor the crankcase conditions for a fleet of vehicles rather than the Oil Life System which has no means to measure soot, viscosity, engine wear, moisture and oil acidity. Our low cost Analysis Kits also keep an on-going record each time you send in your next sequential sample.

Please examine the our suggested AMSOIL 15W40 and HDD 5W30. There are several benefits but mainly lower engine operating oil temperatures by 10 to 20 degrees, zero sludge and soot deposits, resistance to harmful corrosion (which is why this is is also a marine oil), the guarantee and an average increased mileage of about 1.5 MPG. This product is responsible for many customers becoming dealers earning several city fleet accounts. The 15W40 is amazingly low cost for the overall savings, so if you are not using it, you're just throwing away good money.

With the 15W40 you simply cannot get a better value in motor oil. Since 1976 this has been improved constantly to exceed all future engine, EPA and API requirements. Try it out and you will never switch back. If you are in extreme low temperature areas, we also suggest the AMS-Oiler for easier winter starting. The AMSOIL HDD is of higher quality for those who want better mileage for the longer intervals and those who demand the best. It does cost more but you do get what you pay for.

Read on......

Change your Mind - NOT Your Oil!

Join as a Preferred Customer and save now. See what it's all about.

Switch to AMSOIL 15W40 or 5W30 HDD save time, fuel and cut your oil consumption significantly.

This means your use of AMSOIL HDD in your GMC Duramax can be used up to 25,000 miles or one year if no analysis is used. Knowing that GM designs these intervals to be conservative (using conventional SAE 40 motor oils), the use of an oil analysis will generally prove that the AMSOIL HDD (or AME) is still within the proper specs regarding to alkalinity, wear metals, soot, NOx% (nitration and oxidation), water, fuel, etc.. The whole point of AMSOIL is to reduce costs and increase the life of your engine and drive train. The ANALYSIS company makes the recommendation to help you dial in on this.
Why in the world would you change the oil if it's still good? There is no benefit. And why would you use another oil when AMSOIL users experience instant fuel economy increases of 5% to 15%??  (8% to 15% when AMSOIL is used through out the power train and intake filters) 

"I'm so tired of $60+ oil changes every 3 weeks and having to wait and watch over some one else change my oil! What is bulk oil anyway?" AMSOIL 15W40 is the solution to this problem!

Most AMSOIL diesel customers buy direct to get the best price and ordering simplicity. Call me at 1-800-579-0580 with questions ask what the price is on our email form or read about the Preferred Customer to buy at outright wholesale.

By-Pass Remote Filtration Units - Eliminate virtually all engine wear

BMK-27 (complete with filters ) Chevrolet GMC Duramax Diesel in pickups, etc.

EAO-26 and EaBP-100 (Filters Included)

New Single Remote Bypass Adapter Kit for BMK-21 - Most compact set-up Sandwich adapter, Aluminum billet oil filler adapter cap return.


By-Pass Filtration

Use our By-Pass filtration kits and extend changes even further while virtually eliminating all engine wear. (Filters less than 1 micron particle size and will hold up to a quart of water).. If you don't use AMSOIL use the By-pass kit at least. It filters 5 quarts in 5 minutes at 45 miles per hour. When using AMSOIL HDD Diesel your engine will run smother, quieter and many even notice a decrease in engine drag. Our gear and differential lubes will add to the economy. Most use the Heavy Duty Diesel and Marine 15W-40, AMSOIL grease, 75W-90 gear lube and the Universal ATF in the automatics. 

If you want to avoid problems with soot and deposits, the By-Pass is your solution. Call me at 800-579-0580 for exact list and price or email me at


Single Bypass Filter Install:

If you want to use the BMK-21 for a more compact mounting call about our new sandwich adapter which makes installation easy and you keep your full flow filter in the original location. Oil is fed from a simple adapter, then returns to either the pan or an optional oil fill cap adapter.

Buy the BMK-21 and send in photos of your install and I'll rebate you $20 when you make your purchase here. Plus you save over AMSOIL direct ordering. I'll explain how.1-800-579-0580

6.5 and 6.6 By-Pass install photos:

2005 Install photos - Silverado 6.6

2002 Chevrolet 2500 HD Silverado Crew Cab Pickup

2001 GMC 2500 HD 6.6 diesel

Complete database of BYPASS install photos (over 50)

For the best price on all AMSOIL products sign up as a Preferred Customer for just $20 per year and order direct wholesale. For more information visit - What is a Preferred Customer.

See Diesel data sheets here:  Diesel Oils

We also have commercial account pricing for use within your business. Contact us for price.

Testimonial: Several of our customers using the diesel products for the first time always send feedback regarding their amazement on how well the oil actually performed. They can't believe how smooth the engine now runs and sometimes the mileage quoted sounds very exaggerated!  Don't forget to examine the AMSOIL gear and transmission products to maximize your efficiency and totally extend all your fluid requirements.

  • Oil ANALYSIS KITS - These kits retail for about $27 with two way postage included. To sample your oil you can either purchase the $25 pump with hose (Vampire™ Hand Pump - same as military uses) for easy extraction from the dipstick tube. Order G-1206
    For owners of the By-pass kit, use the drain valve attached to the manifold for the quick and easy extraction. 
    Order BK-13.

Keep your  GMC Duramax fuel system clean. Posted on the "Diesel Page" was a recent article by Kennedy Diesel aftermarket parts (who recommends and sells AMSOIL Products), suggests a upgrade kit to the current fuel filtration system due to the less than stellar quality and cleanliness of the available diesel fuel here in the US.  We suggest using the AMSOIL Diesel Fuel Additive to keep injectors clean and lubricated properly. This unique product also drops the gel points by 20° to 30° F allowing you to avoid more expensive winter fuels and additives.

We also have Donaldson fuel filters available now.

NEW Absolute Efficiency Air Filters!

Nanofiber technology has been used exclusively in heavy duty applications, including the US ARMY Abrams M1 tank. AMSOIL has brought this technology to the auto/light truck market. AMSOIL Ea Air Filters provide the absolute best filtration and with an unmatched 4-year/100,000-mile guarantee, AMSOIL Ea Air Filters save money! Revolutionary Technology

Revolutionary Technology
Nanofiber is a phrase generally referring to a fiber with a diameter less than one micron. Cellulose fibers, on the other hand, are larger than nanofibers and have larger spaces between the fibers, causing contaminants to load in the depth of the media and plug the airflow path, resulting in higher restriction and less capacity.

AMSOIL Ea Air filters incorporate a specially constructed cellulose media with exclusive synthetic nanofibers applied to the surface. Dust and submicron particles are trapped on the nanofiber surface, preventing them from lodging in the filter media depth.



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