MOTUL FUEL SYSTEM CLEAN is an additive designed to remove contamination from the fuel system. Cleans from the fuel tank to the combustion chamber. Dissolves resins and gums in carburetors and injection systems. Lubricates and protects the upper cylinder as well as removes coking and unburned carbon residues. Improves winter cold starts. Removes contamination from the fuel tank to combustion chamber. Dissolves resins, gums in carburetors, injection systems. Lubricates, protects the upper cylinder and removes coking, unburned carbon residues. Improves winter cold starts. TYPE OF USE: Directly pour one can of MOTUL FUEL SYSTEM CLEAN in the gas fuel tank before refueling. The fuel system will be then gradually treated from the tank to the combustion chamber. One can of MOTUL FUEL SYSTEM CLEAN is sufficient for tank capacity up to 16gal. In case of bigger tank capacity, the recommended mixing ratio is 0.50% (200:1). Do not exceed the recommended proportion. If necessary, proceed with 2 successive treatments.