Lead and silicone-free, does not harm catalytic convertors, oxygen sensors or fuel injectors. Blend of powerful cleaning solvents, designed to quickly and safely remove and dissolve performance-inhibiting residues such as grease, gum, dirt, sludge, fuel and varnish deposits from carburettors, heat valves, automatic chokes, throttle plates and linkages, PVC valves and heat risers. Can also be used to clean butterfly throttle valves. Maximises carburettor performance and helps improve fuel system efficiency. Maximises Fuel Economy Lead & Silicone Free Enhances Fuel System Efficiency Maximises Fuel Economy Lead & Silicone Free Enhances Fuel System Efficiency