Cleans and protects the entire fuel system from performance loss with just one treatment. STP formulation contains the highest level of detergents of any STP formula. Helps clean the entire fuel system to restore its optimum operating condition. Advanced formula cleans fuel injectors, carburetors, intake valves and ports, combustion chambers, cylinder heads and piston tops. Helps to restore lost power and acceleration, reduce hard starts and engine hesitation, stop knock and ping. Contains jet fuel, a high quality carrier of active ingredients. Use every oil change or 4000 miles. Safe for all gasoline engines.