Quickleen is a deep cleaning treatment that should be used periodically. Use Quickleen to deep clean fuel systems that have been neglected for a period of time. Aggressive cleaners work to quickly and thoroughly remove carbon deposits from carburettors and injectors, intake valves, spark plugs, piston crowns and cylinder heads.Use Quckleen to:Prevent engine knocking and piston seize-upExtend spark plug lifeThis product does not contain fuel stabilizers. Use with Quickare to prevent fuel breakdown and oxidation.1 ounce treats 5 US gallons - 12-ounce bottle treats US 60 gallons. Quicksilver Part No: 92-8M0079744