Formulated for vehicles that have not had regular fuel system maintenance. Uses H. E. S. T. and powerful detergents to maximize one-tank clean-up of intake valves, fuel injectors, carburetors, and combustion chamber. Dissolves gum, varnish, and carbon deposits in the entire fuel system to help restore lost power and peak performance. Improves starting, drivability, gas mileage, and injector life. Catalytic converter and oxygen sensor-safe.