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Amsoil has tested all oil additives and again they have not found one that will help the oil. If additives are used in conjunction with their oil it will void the warranty. Oil manufacturers design oil additive packages to work with their oils to achieve specific goals, and the additives react in specific ways. When you add an unknown it can and has damaged the original design of the oil.

Yes Amsoil is in the business of selling oil, but most of their oils are designed to last 25,000 miles or longer. No after market additive is designed to last this long and thus will shorten the use full life of the oil, which in turn will require more frequent oil changes and thus they would be selling more not less oil.

Now gas additives I can understand. All gas brands do meet the minimum EPA standard for cleaning, but even the EPA standard is a little lacking.

Tom