STA-BIL 360 Marine is the only fuel treatment to emit a revolutionary vapor technology that rises above the fuel line to protect your engine where others before it can’t. Use it with every fill up to help keep your engine running cleaner, leaner, smoother and stronger than ever. Usage Directions 1 ounce treats up to 5 gallons of fuel. Recommended for use at every fill up in small engines, and vehicles using Ethanol blended fuels. Product does not contain alcohol. Perfect for use in all boats, jet skies, and other watersport engines.