Lucas Complete Engine Treatment is a unique formulation that cleans and lubricates multiple systems in your vehicle. When added to fuel, it cleans and lubricates all components from the fuel tank to the cylinders. It removes deposits, protects against corrosion and helps the fuel to burn more completely, which helps to lower emissions, improves fuel mileage and increases power. When added to your oil, Lucas Complete Engine Treatment cleans your engine and forms a protective barrier against heat and friction, improves oil flow in cold weather and extends oil life. FOR ALL ENGINES AND OIL TYPES.