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Frequently Asked Questions

I F YOU HAVE A concern or question that you would like to have answered or otherwise addressed, please EMAIL us so we can familiarize you with our products, and also include your inquiry with our other listings of Frequently Asked Questions. If you have questions, chances are good others will be interested in learning also, so please do contribute!

What are AMSOIL Synthetic Motor Oils?

AMSOIL Synthetic Motor Oils are high performance, extended life oils manufactured from premium synthetic base stocks and special purpose additives. These "designer oils" (so nicknamed because their molecules can be structured to do a specific job) provide significant improved overall performance benefits over conventional petroleum oils.


How long have AMSOIL products been available?

In 1972, AMSOIL introduced the first synthetic motor oil with an API (American Petroleum Institute) Service Classification. Since that time, AMSOIL has added many premium products to its original oils, and distributes them through a highly efficient dealer-to-customer network. Learn more at AMSOIL, An American Success Story.


Can AMSOIL Motor Oils be used in any engine?

Yes. AMSOIL Motor Oils may be used in any mechanically sound gasoline or diesel fueled engine.


What AMSOIL products should I use for my Harley Davidson motorcycle?

See our recommendations for Harley Davidson bikes.


Will using AMSOIL Engine Flush in motorcycle engines damage the wet clutch?

Engine Flush may not be compatible with some wet clutch systems, and the generally small oil capacities of motorcycles can easily allow over-dilution of the oil. Therefore we do NOT recommend the use of engine flush for motorcycle applications.


Will AMSOIL Motor Oils void my new vehicle warranty?

No. Manufacturers' warranties are based on the use of oils meeting specific API Service Classifications, for example SJ/CF. AMSOIL motor oils meet the current API Service requirements and are perfectly suited for use in any new vehicle without affecting the the new vehicle warranty. Find out more about the Magnusson-Moss Act which was enacted to protect consumers from warranty fraud.


If AMSOIL is so good, why don't the auto makers pre-fill with AMSOIL at the factory?

Simply because they are so good. The auto manufacturers' and your dealer actually want your vehicle to wear out and have a life-span within a specific period of time, so you have to buy a new one, or come to the dealer for repairs. AMSOIL lubricants have been proven for over 25 years and hundreds of millions of miles to significantly extend the life of a vehicle's engine and drive-train. Read the article in Lubes'N'Greases Magazine.


What is the Four Ball Wear Test?

The Four Ball Wear Test puts one rotating ball against three fixed balls under specific conditions of pressure, temperature, revolutions per minute and duration. he test may be used to evaluate the friction- and wear-control ability of liquid lubricants or greases in sliding contact. The Four Ball Wear Test is a good laboratory tool for developing oils with good engine wear control.

The results appearing on the AMSOIL Series 2000 20W-50 Racing Oil (TRO), Series 2000 0W-30 Motor Oil (TSO), and Series 3000 5W-30 Heavy Duty Diesel Oil (HDD) were from testing done by a well known independent lab. Such a facility would not jeopardize its reputation by misrepresenting test results.

AMSOIL ran literally thousands of tests in our own lab before we sent the product for testing. The independent lab's results correlate very well with our own.


Are AMSOIL products warranted?

Yes. Simply stated:
AMSOIL, Inc. warrants that the use of its lubricants will not cause mechanical damage to any mechanically sound equipment when AMSOIL Inc. products are use in full compliance with the company's recommendations and instructions.
Read the entire warranty here.


Will I see an increase in gas mileage with AMSOIL?

AMSOIL Motor Oils reduce friction and drag better than petroleum oils and other synthetic oils, resulting in significant mileage increases. In a recent 1.2 million mile demonstration, AMSOIL showed a 4.5% increase in gas mileage. Other tests have shown greater increases under certain weather and driving conditions. Every vehicle is different, as are driving habits and conditions, and it is difficult to predict an actual increase.


Are AMSOIL Motor Oils All-Season Motor Oils?

Synthetic oils are formulated to perform better than petroleum oils at both high and low temperature extremes. That's why every jet engine in the world is uses synthetic oil (and have from day 1). AMSOIL Synthetic Motor Oils have extremely low pour points and flow easily at extremely low temperatures for easier winter starting and significantly reduced engine wear. At high temperatures, no conventional motor oil can compare to the overall protection AMSOIL Synthetic Motor Oils provide. That's extremely important for today's high-powered, higher-revving engines.


Can AMSOIL Motor Oils be mixed with other synthetic and petroleum motor oils?

Yes, AMSOIL Motor Oils are compatible with all other synthetic or petroleum motor oils. However, the mixing of AMSOIL with other oils will shorten the effective life of the AMSOIL lubricant.


Should after-market oil additives be used with AMSOIL Motor Oils?

No. They are not necessary and can be harmful. AMSOIL Motor Oils are properly formulated under the strictest quality control to provide superior performance, and do not need any additional additives. Read this article.


How do AMSOIL Motor Oils achieve extended drain capability?

AMSOIL Synthetic Motor Oils are highly resistant to the destructive effects of heat and do not break down like petroleum oils. This means that AMSOIL Motor Oils can provide much longer drain intervals than conventional oils.


Will I see a decrease in oil consumption with AMSOIL Motor Oils?

Yes. When used in mechanically sound engines, AMSOIL Motor Oils can reduce oil consumption. However, AMSOIL Motor Oils will not "fix" an engine that has other mechanical problems causing excessive oil consumption.

How do I change over to AMSOIL Motor Oils?

In engines with over 30,000 to 40,000 miles or in older vehicles, it may be wise to use AMSOIL Engine Flush first. This will ensure that the engine is clean and free of any accumulated dirt or sludge which might have affect on the life of AMSOIL Motor Oils. It is always a good idea to install a new AMSOIL Super Duty Oil Filter (SDF) every time you change oil, in order to receive the maximum benefit of the superior qualities of AMSOIL.

I have a small 25hp marine diesel, and I am looking for a new fuel filter. I need a bleed screw on the top of the filter so I can bleed the air out after changing the filter. Your filters have a Removable Primer Plug. Can this used to remove the air from the filter so I won't have to pump all the air through the entire system to bleed the engine?

The instructions that come with the ADF-75 unit state that when the element is changed, the priming procedure would help eliminate air from entering the unit. The instructions state that when the filter element is replaced, the bowl should be filled 2/3 with fuel, and when the bowl is re-attached, complete the prime through the primer plug. The one-way check valve and the location of the inlet and outlet tubes (at the top of the unit), help eliminate air.

Can I use AMSOIL AFF 0W-40 in my new 4-stroke snowmobile?

Absolutely! AMSOIL AFF 0W-40 was specifically formulated for use in small, hard working 4-stroke engines. AFF is ideal for 4-cycle snowmobiles, ATV's, personal watercraft, 4-stroke boat motors, lawn equipment etc...

Can I use AMSOIL AFF 0W-40 in my car or truck?

YES. AMSOIL AFF 0W-40 can be used in in any gasoline 4-stroke automobile engine. Recommended change intervals are at 7500 miles, or 6 months. AMSOIL AFF can also be used in diesel powered cars or trucks, with change intervals as recommended by your vehicle manufacturer.

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