Quickleen Engine and Fuel System Cleaner 8M0047921 is a fuel treatment solution for use in all 2 and 4 cycle carbureted and fuel-injected gasoline engines, including cars, trucks, motorcycles, ATVs, snowmobiles, marine engines, lawn mowers, chain saws, string trimmers and snow blowers. Safe for catalyzed engines. It can help maximize engine performance with all grades of gasoline. It will help control corrosion and gum and varnish build-up. It will quickly and thoroughly remove carbon deposits from carburetors, injectors, intake valves, spark plugs, piston crowns and cylinder heads. It can extend spark plug life and prevent engine knocking and piston seize-up.