AMSOIL Power Foam removes gum, varnish and carbon deposits for more efficient fuel economy and improved overall engine performance. AMSOIL Power Foam cleans intake valves, intake manifolds and throttle plates to keep the combustion intake system running at peak efficiency. Effective in both two-cycle and four-cycle engines, AMSOIL Power Foam eliminates engine ping and keeps carburetors and injector systems properly tuned. AMSOIL Power Foam is safe for fuel injectors, catalytic converters and emission control devices. It will not damage seals, gaskets, rubber or plastic materials commonly used in gasoline engines.