Add Quickstor Fuel System Treatment And Stabilizer to fuel before long-term boat storage to prevent regular and ethanol-blended fuel from breaking down and oxidizing for up to a year. Formula also guards against fuel system corrosion and keeps gum and varnish from forming and settling in fuel lines and tanks, carburetors, and injectors. Use in all 2 and 4-cycle fuel-injected gasoline engines including cars, trucks, motorcycles, ATVs, snowmobiles, marine engines, lawn mowers, and more. Safe for catalyzed engines. 1 oz. will treat 5 gallons of fuel.