The Royal Purple Max-Tane Diesel Fuel Additive provides cetane boost, anti-gel, detergency and lubrication for the entire diesel fuel system. Max-Tane is for year-round use in all types of light, medium and heavy duty diesel engines, and is compatible with any grade of diesel fuel, including biodiesel and ultra-low-sulfer diesel. Max-Tane prevents gelling, improves fuel economy, lubricates and cleans the fuel system. It is safe to use with all types of diesel exhaust emission systems.