Some also provide a coating of sorts to the engine internals and others help break up and flush out sludge. There are even some that serve as additives for other types of automotive fluids.

Adding an engine flush to your oil change routine can help remove sludge and buildup ... and its engine flush is one of the best on the market. It's suitable for use on all gasoline and diesel ...

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