To treat carbon deposit removal Not for use on diesel systems When fuel injector or carburetor is malfunctioning due to carbon deposits, one 16 oz. bottle should be used to treat 36 gallons To keep fuel injectors or carburetor in optimal operating condition, 16 oz. should be used to treat 72 gallons. Sold each Brand new, genuine Johnson Evinrude OMC Fuel Systems Cleaner 16oz. This is a factory original equipment part, not aftermarket. Fits: 2-cycle engines 4-cycle engines .