OEM Yamaha fuel treatment removes deposits from fuel injectors, carburetors, intake valves, intake ports & combustion chambers. Yamaha ring free plus 12 ounce bottle treats 120 gallons Exclusive synthetic formula is specially formulated for E10 fuels Improves power in 2-stroke and 4-stroke marine engines Cleans entire fuel system protecting engine from premature failure Prevents corrosion and rust Contains metal filmers to help protect fuel system components like silver solder, copper, aluminum, and steel from the corrosive affects of ethanol sulfate salt