Product Description: Treats up to 512 gallons of fuel. Star*Tron Enzyme Fuel Treatment uses unique enzyme technology to improve overall fuel quality.Star*Tron makes engines start easily and run smoothly. It "cures & prevents" Ethanol fuel problems such as water in fuel, or lost power. It also helpsprevent phase separation, removes gums, varnish and carbon deposits and will stabilize fuel for upto 2 years. It works in boats, cars, motorcycles, small equipment or any other 2 or 4-cycle engine.