Sta-bil 8oz. Marine Ethanol Treatment is specially formulated for coastal environments to protect your marine engine from ethanol-related damage. This advanced formula prevents corrosion, cleans fuel systems, and stops gum and varnish buildup, ensuring reliable performance and longer engine life. One ounce treats up to 10 gallons of fuel, maintaining freshness for up to 12 months. Suitable for all gasoline engines, including 2-cycle, it enhances power and fuel efficiency while guarding against ethanol and condensation effects. Use at every fill-up for optimal protection and performance on your boat or jet ski.