Dura Lube Severe Fuel System Cleaner is precisely formulated to clean the entire fuel delivery system including fuel injectors carburetors valves ports and intake manifolds. Dura Lube Severe Fuel System Cleaner also helps remove valve stem gum and fuel system deposits. A cleaner running engine helps improve fuel mileage. Dura Lube Severe Fuel System cleaner is compatible with all grades of gasoline fuel including E-10 E-15 and E-85 Ethanol blends and all octane levels. It is not for use in diesel engines. Dura Lube Severe Fuel System Cleaner will not harm catalytic converters. Universal vehicle type