Rislone Fuel Injector Cleaner with Upper Cylinder Lubricant (UCL) from Bar's Products combines a unique blend of additives to clean and lubricate the entire fuel system and protect the engine. It is designed to reduce carbon build-up, clean fuel injectors to improve fuel economy and eliminate hesitation and pinging/spark knock. UCL creates a lubricating film that helps prevent carbon from sticking so it can be burned off. The additive can be used with all gasoline, ultra-low-sulfur diesel, E-85 ethanol, oxygenated and bio fuels. It is available in a single-use 6-oz. bottle, 32-oz. bottle, 5-gal. pail and 55-gal. drum.