Sta-Bil Marine Ethanol Fuel Stabilizer & Treatment. 32 oz. Bottle 1 Oz. treats 5 gallons. America’s #1 Selling Marine Fuel Additive Brand. Best Ethanol Problem Fighter. More than four times the Fuel System Cleaner than in Regular STA-BIL Double the corrosion preventer than in Regular STA-BIL Prevents corrosion from moisture & ethanol-induced water attraction. Improves marine engine performance Year-Round, not just for seasonal storage. 6 per case.