Quickare Fuel Treatment This is a genuine Mercury Marine factory OEM part, not aftermarket. 1 ounce treats 10 gallons 12 ounce bottle treats 120 gallons. 1 Bottle 355ml / 12ozIt is for use in all 2‑ and 4‑cycle carbureted and fuel‑injected gasoline engines including cars, trucks, motorcycles, ATVs, snowmobiles, marine engines, lawn mowers, chainsaws, 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, gun and varnish build-up and phase separation associated with ethanol blended gasoline. It will also help control corrosion, gun and varnish build-up and phase separation associated with ethanol blended gasoline while cleaning existing varnish and gum deposits in fuel lines, tanks, carburetors, injectors, intake valves and spark plugs.