AMSOIL Power Foam® (APF) improves engine performance by removing gum, varnish and carbon deposits that affect power, operation, idle and fuel economy. 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 gasoline engines, AMSOIL Power Foam helps reduce engine ping and keeps carburetors and injector systems operating like new. 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.