STP

STP (originally "Scientifically Treated Petroleum") is a long-standing American automotive additive brand founded in 1954. The brand became a fixture of mass-market parts-aisle merchandising in the 1970s and 1980s — its fuel injector cleaner and oil treatment bottles are common at drugstores, gas stations, and auto parts retailers across the United States. Today STP is part of Energizer Holdings, Inc. (which also owns Armor All) and is manufactured and distributed by Energizer Manufacturing, Inc. out of Westlake, Ohio. The Super Concentrated Fuel Injector Cleaner — sold in a 5.25 oz bottle marketed as a one-bottle-per-oil-change treatment — is the brand's most widely distributed consumer SKU.