Restore performance to your vehicle's engine with STP Super Concentrated Fuel Injector Cleaner. This advanced fuel additive helps unclog dirty fuel injectors, saving gas and restoring lost power. Concentrated detergents in every bottle help dissolve and remove harmful carbon, gum and varnish deposits on fuel injectors. Without routine cleaning, those deposits can build up, leading to hard starts, lost acceleration and rough idling. By adding a bottle of this fuel additive to your gas tank, you can help clean dirty fuel injectors. Use STP fuel injector cleaner every 4,000 miles or at every oil change to help keep your engine running at peak performance. STP Super Concentrated Fuel Injector Cleaner is safe for any gasoline engine and is compatible with cap‑less gas systems. For over 60 years, and for more miles than anyone can count, STP has been one of the most trusted names in automotive care.