UDiesel Fleet additive is engineered for modern diesel engines to address poor diesel fuel refinement and ULSD (Ultra Low Sulfur Diesel). This proprietary carrier formula will increase performance, clean engine parts, and add lubricity in high fleet applications for large fuel tanks and haulers. The Diesel Fleet additive solves issues caused by ultra low sulfer diesel and biodiesel. The same engineering that goes into the award winning octane products has gone into the new line of diesel additives. Made specifically for large fuel tank and fleet hauler applications. Give your vehicle the diesel fuel it needs in high concentration and compact size. Recover lost power, increase overall fuel efficiency, clean and protect injectors, and maintain healthy filters. BOOSTane Diesel Fleet Additive is Cetane Engineering done right. For best results, mix the cetane booster with diesel fuel based on the mixing chart for desired results.