Maintain your engine's efficiency with STP Fuel Injector Cleaner & Carburetor Cleaner Treatment. This fuel additive fights deposit buildup and engine friction to keep your vehicle running smoothly while reducing hard starts, lost acceleration and rough idling. Formulated to keep fuel injectors and carburetors clean, this auto care fuel treatment also helps you save gas. This fuel injector cleaner tool is made with jet fuel, a high-quality carrier of active ingredients. Use this fuel additive each time you fill your tank and when you do an oil change. Safe for use in all gasoline engines, this fuel injector cleaner kit is cap-less compatible.