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. Add to petrol or diesel fuel - add approximately 30 ml per 3.7 litres. One bottle treats a tank, up to 80 litres, add directly to fuel tank. Add to 2-stroke fuel - add 30 ml per 3.7 litres of pre-mixed fuel. Add to engine oil - add 30 ml only per litre of engine oil. May be added with oil change or between oil changes.