STA-BIL Marine Formula - The STA-BIL Marine Formula is America's number one Selling Marine Fuel Additive Brand! STA-BIL Marine Formula Ethanol Treatment and Performance Improver contains double the corrosion preventers and more than four times the fuel system cleaner than in Regular STA-BIL brand to prevent against corrosion and deposit build up in Marine Engines. The 8oz size treats up to 80 gallons. The 32oz size treats up to 320 gallons. Use at every fill up to protect your boat or other marine equipment.