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

Use oil analysis (available here) and reach 20,000 to 100,000 miles per oil change. (By-Pass filter needed to achieve oil life beyond 30,000 miles.) Using analysis gives you the piece of mind you deserve and is a more responsible method to monitor the crankcase conditions 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 a on-going record each time you send in your next sequential sample. One drawback of the earlier Duramax 6.5 engine was the lower oil capacity. The bypass system increases the system capacity allowing for more soot and acid protection - another advantage.

I suggest taking a oil sample before you convert to AMSOIL just to see the current condition of the oil you are using especially if you bought your truck used. And also to note or be alerted to any wear conditions that may exist. Then once you have installed the appropriate AMSOIL synthetic oil and filter, change your filter and top off at your next normal interval. Example, If you are doing 4000 - 5000 mile oil changes currently, change your AMSOIL SDF filter at that point (7000 is a good point with the AMSOIL oil filter), then top off the oil. You could simply go to 15,000, (that is with the filter change in the center of that interval) then completely drain and fill with a new filter OR change the AMSOIL at 6-months whichever comes first. That is the basic coverage for AMSOIL's synthetic diesel motor oils as stated on the data sheets. AMSOIL Synthetic Diesel Oils are designed to last at least twice the manufacturers recommended interval.

I personally suggest once you reach the manufacturers recommended interval (2500, 5000, or 7500) to change the oil filter (AMSOIL SDF-52 for GMC and Chevy Duramax) and top off. At this point you may want to get the engine back to operating temperature and pull a sample for your own peace of mind. Our kits are postage paid and simple to use. More about that below. Next when you reach your next incremental interval, change the filter again, top off, and sample again as needed. In most cases the sample will come back, "No Corrective Action Required. Oil Is Suitable for Continued Use. Resample at Next Normal Interval."

 If you have not seen the data on AMSOIL's superior synthetic diesel product, before you leave please visit our Diesel Oil section but first check out the By-Pass filter section below.  AMSOIL 15W40 and Series 3000 5W30 is best priced in our 4-gallon case or larger containers.

The most common comment I get from my diesel customers (most use our lower price AME 15W40) is, "I expected a little increase in mileage but nothing like this! I can't believe it!" 

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.

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 generally be used up to 25,000 miles w/ analysis or 6 months 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?  And why would you use another oil when AMSOIL users experience instant fuel economy increases of 5% to 15%??  (6% to 15% when AMSOIL is used through out the power train and intake filters) 

It is highly likely when using analysis your results will return saying - continue use till next interval - change filter and top off.. It's still good! you save money, have a new filter and replaced about 2-quarts raising the level of acid and soot control even when new EGR systems are used. 

By running analysis at the GM recommended intervals (2,500, 5000, 7,500)  and changing the filter at that time of (SDF-52) interval you will likely reach 15,000 to 20,000 miles or more and save the cost of several changes, less wear on your engine and better gas mileage. With analysis you always win!

"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!

For your first order two or three SDF-52 filters, one 4-gallon case of (AME) 15W40, two test kits (G-1451) and 1 can of our (AEF-CN) engine flush for high mileage changeovers when converting to synthetic for the first time. For other engines there are several different filters so just provide the year and engine on your order or catalog request.

If using the engine flush, I first start by purchasing a cheap oil filter just for the engine flush. This will also bring the oil level down enough to add the flush (follow instructions on can - one can per 5 quarts sump but one is usually quite enough) and catch more of the deposits assuming your current filter has expired.

Once you have changed your oil, watch your mileage. Most customers are pleased with the added mileage. Try our Heavy Duty Diesel (HDD) 5W30 for even more efficiency in the Duramax.

Oil analysis information is found at the end of this page.

Most AMSOIL diesel customers buy direct to get the best price and ordering simplicity. Read about the Preferred Customer Program to buy at outright wholesale.

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

By-Pass Filtration (BMK-17)

Use our By-Pass filtration kits and extend changes even further while virtually eliminating all engine wear. (Filters down to 1/10 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. Generally costs between $150 to $240 each depending on which engine you have and if you use the single, dual remote or Dual Guard.

For your Duramax order the BMK-17 mounting system. Includes the SDF-26 full flow filter and the BE-100 By-Pass unit. I also suggest at least one Oil Analysis kit G1451 so you can take a sample of the existing oil before you drain to have something to compare with AMSOIL and make sure there are no issues currently.

For more information please visit the description on the AMSOIL filter kits.

In Turbodiesel applications our AMSOIL SDF Full-Flow Filters are recommended for 7000 miles or 6 months whichever comes first. Change other manufactures' filters at the engine manufacturer's recommended filter change intervals.

In Heavy Duty Diesel Commercial trucks it in not unusual for the engine manufacturer to recommend 25,000 and 50,000 without By-Pass filtration. Mack has designed an engine for 40,000 miles per change recently. AMSOIL has been tested on the road using analysis and By-Pass filtration for up to 409,000 miles. 

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.

I include the proper DATA SHEETS to every catalog request relating to your vehicle.

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!  One of my customers actually made it into the 2003 AMSOIL calendar!  Don't forget to examine the AMSOIL gear and transmission products to maximize your efficiency and totally extend all your fluid requirements.

ANALYSIS KITS - These kits retail for about $24 with two way postage included from UPS. To sample your oil you can either purchase the $25 pump (G1206) with hose (Vampire™ Hand Pump - same as military uses) for easy extraction from the dipstick tube. You may drain a portion from the drain plug (difficult to get a representative sample) or if you have the By-Pass kit use the drain valve attached to the manifold for the quick and easy extraction. 

Contact us for these kits. Non postage kits sell for around $15 if you need to do several vehicles together. Co-op discounts available for fleets. 

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.

AMSOIL Diesel Fuel Additive is available at a great price. Fuel pressures as high as 23,000-psi demand much from the high-pressure pump and solenoid-controlled fuel injectors, so this is definitely an area to not overlook.

TS-123 AMSOIL Flowzair Air filter for Duramax 6.6- (1994-2000 6.5 uses TS111) Both Chevy and GMC (except 2000 Chevy and all vans use TS-83.) 

 Air restriction will kill performance in a TURBO charged diesel. Take advantage of AMSOIL's newly re-engineered 2-stage foam air filters. Same pricing, better materials. A properly designed dual-stage oiled-foam element traps dirt better than any other filter media. AMSOIL has recently upgraded their materials for more dispersant area in the foam. The 2^nd stage material is a new Polyethylene closed cell based mater treated with a new filter oil. This new material contains 125,000 ppi3 (pores per cubic inch). And the 1^st stage a new 8000 ppi3 pores per cubic inch. Delivers a phenomenal 2000 SQft of filtration surface area per cubic foot of filter media. More contamination trapping surface area than any filter known. Now an 18% better air flow and 99.5% cumulative efficiency rating.

Also re-designed  is the gasket sealing edge utilizing a new base material. A blue Ethylene Vinyl Acetate (EVA), which not only looks better, but also creates an un-compromised seal, better fit and designed to be used over several times. Vibration proof positive sealing with as little as 10% compression and more. 

The metal support frame has been improved to an 18-gauge and the hole size changed to 3.96 mm circular–turbo-perforations to assure air flow is maximized! Typically weaker materials would flex under the Duramax turbocharger vacuum.

We can also offer you a great price on Hastings fuel filters which should not be ignored for regular maintenance or you may loose all performance. The fuel filters are the most overlooked part in most diesel engines.

We also have the Hastings line of Fuel Filters (FF1120) and the Transmission spin-on (hydraulic) filter.. (HF992)

Trucking and Fleet