Extend your engine life by reducing cylinder wear. Allstar Performance Upper Lube fuel additives are a high temperature cylinder lube that protects and lubricates your fuel system. It mixes completely, won't separate from the fuel, leaves no varnish residue, and does not contain a flame agent. Upper Lube additive also lubricates valves, guides, cylinders, and fuel system components, while reducing corrosion, fuel wash down, and chalky residue. Choose a bottle with fragrance, if you like.