This STA-BIL Storage Fuel Stabilizer keeps gasoline fresh and ready for dependable starts during long-term storage. The 4 oz formula prevents oxidation, gum, and varnish buildup for up to 24 months, eliminating the need to drain fuel before storing vehicles, seasonal equipment, or other gasoline engines. It works in both ethanol and non-ethanol gasoline for use in cars, motorcycles, small engines, generators, and boats.