Star Brite Ring Clean Plus helps anglers keep gasoline engines running clean through repeated trips, ethanol-blended fuel use, and long days chasing walleye, bass, salmon, or musky. This 8 oz. fuel system cleaner uses deposit control compounds and a proprietary enzyme package to remove existing deposits and help reduce new buildup in carburetors, fuel injectors, intake ports, and combustion chambers. Add 1 fl. oz. for every 10 gallons of gasoline, with one bottle treating up to 160 gallons, then treat every 4 to 5 tanks or as needed to maintain engine performance. For regular upkeep, use original Star Tron Enzyme Fuel Treatment at every fill-up to help maintain peak engine performance between Ring Clean Plus treatments. Removes existing deposits and helps prevent new deposit formation Helps clean carburetors, fuel injectors, intake ports, and combustion chambers Compatible with all gasoline engines and useful for ethanol-related deposits 8 oz. bottle treats up to 160 gallons of gasoline Made in the USA