Check Latest Price Our Verdict on the Best Oil Additives. Our pick for the best oil additive is the Archoil AR9100.It is versatile, and it can solve Powerstroke cold start issues.

If you want your 1974 Maserati Bora to last, use the best oil additive you can find. Photo credit: David Traver Adolphus / AutoGuide.com.

If you want your 1974 Maserati Bora to last, use the best oil additive you can find. Photo credit: David Traver Adolph Lucas Oil Stabilizer is the preferred oil additive of many mechanics—and ...

Oil additives play an essential role in maintaining car engine health. They provide additional lubrication, protect against wear and tear, and help remove impurities and build-up from your engine.

For under $25, you can get any of the best engine oil stop leak additives in small quantities, like 8 ounces and 24 ounces. Spending more often means getting a larger bottle or even a multi-pack.

Under normal circumstances, most modern engine oil and gasoline brands work fine on their own to keep your engine running smoothly. But there may be cases where even the best of them could use a ...

Don't let your transmission slowly wear away and deteriorate. Check out AutoGuide.com's recommendations on the best transmission fluid additives.

How To Solving the ‘Mystery’ of using a fuel and oil additive John Paul, AAA Northeast's Car Doctor, answers a question from a reader curious about using Marvel Mystery Oil.