You do not need to use a 5W-20 oil. Do not let your dealer/owner's manual scare you by telling you that you have to use it for your warranty. Once you know the facts and the Federal Magnuson Moss Act law, you will be much better informed to protect your rights and use the type of oil you want to use. See the 5w-20 Issue for more detailed information.

Why does AMSOIL say to change the AMSOIL SDF Oil Filter at six months regardless of the mileage. I have only gone 5,000 miles and figure that I could go the whole year without changing it and be good.

Yes, it is safe to use AMSOIL 10W-30 in an engine that calls for an SAE 30 petroleum oil. All 30 weight oils, whether a 5W-30, 10W-30 or straight 30 weight, perform as 30 weight oils at operating temperatures. The "w" indicator in multigrade oils (10W-30) refers to the oil's cold weather properties. You can think of "w" as standing for "winter" Therefore, a 10W-30 oil meets the "10w" criteria when cold and the "30" criteria when hot.

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.

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. Top

No. AMSOIL is a solo act. Everything your engine needs for lubrication and protection is in the oil. Additives can upset the oil's precise chemistry, or worse, interact with the oil in unpredictable and harmful ways. Save your money ... and your engine. Skip the additives.

Yes. For applications where the oil life indicator light or owner's manual recommended change interval exceeds 5,000 miles and a conventional oil is recommended, Mobil Clean 5000 will provide protection for the full oil change interval.

Yes. When used in mechanically sound engines, AMSOIL Motor Oils can reduce oil consumption. Under test conditions, a reduction of as much as 42% was demonstrated for prolonged periods. However, this should not be taken to mean that AMSOIL Motor Oils are “cure-alls” for engines that consume oil because of mechanical problems.

No, they are not necessary and are extremely detrimental. AMSOIL Motor Oils are properly formulated under the strictest Quality Control procedure to provide superior lubrication performance. See Oil Additives for more detailed information. In regard to AMSOIL Super Duty Oil Filters being inferior to Wix (NAPA) filters based upon visual inspection, AMSOIL Filters have an inner beauty that's not visible to the human eye.

Certainly, AMSOIL Motor Oils may be used in any mechanically sound gasoline or diesel fueled engine. Basically, that means they are excellent for use in any vehicle’s engine.

Yes. Caltex Havoline Formula exceeds the API SL classification which encompasses all earlier API classifications, including API SJ and SH and the obsolete SG, SF, SE, etc. Although API is a U.S. classification, it is widely used by manufacturers from other countries. Check the owners’ manual for your Japanese car, it will almost certainly recommend engine oil using the API system. Further, Havoline Formula was developed with the needs of the Japanese cars in mind.