Contains 100% high-energy solvent technology Helps keep injectors or carb(s) and intake ports and valves clean Quickly disperses moisture and dissolves gum, varnish, and other fuel residues Disperses moisture in conventional gasoline Catalytic converter and oxygen sensor-safe. Item has less than 3% Acetone. Quickly disperses moisture and dissolves gum, varnish, and other fuel residues Use on the entire fuel system, fuel tank, fuel lines, fuel injectors, valves, rings and pistons with H.E.S.T.