... Valve Cleaner4.For the deepest clean, use Valvoline® Complete Fuel System CleanerApplicationsRegular use, summer and winter, maintains optimum ... Treatment protects and lubricates all parts of the fuel system including the fuel pump and injectors allowing more power & performance ... .Use with all gasoline, ULSD diesel, and E85 Flex-Fuel engines.Works with all unleaded, oxygenated, reformulated and bio ...