Sta-Bil prevents corrosion from ethanol-induced water attraction. Recommended for use at every fill up, this complete fuel system cleaner additive cleans up power-robbing deposits from carburetors, fuel injectors, and intake valves to improve engine performance. An 8 ounce bottle of this new concentrated marine formula treats up to 80 gallons. For use in 2 and 4-cycle marine engines. Shipped ground only.