Contains chlorinated paraffins, which some think contributes to inner engine corrosion around extended amounts of time Owned by Energizer, STP has been around since the fifties. This oil treatment can be employed with each conventional and artificial oil. It is best to incorporate STP Oil Treatment to new, warm oil. https://judahkonke.theisblog.com/34671451/an-unbiased-view-of-engine-oil-treatment