Wynn's HIGH PERFORMANCE DIESEL SYSTEM TREATMENT is a chemical treatment composed of detergents and a cerium component that has a triple action: Increases engine performance, Reduces fuel consumption, and Reduces black smoke. It immediately improves combustion, which enhances engine performance and improves acceleration. It also cleans and protects diesel injection systems, protects against oxidation and corrosion, and lubricates to compensate for low sulphur diesel. It prevents deposit formation and does not harm oxidizing catalysts or soot filters of diesel engines. Recommended for all diesel engines. Add every 5000 km/3100 miles. One bottle of 500 ml treats 70 litres diesel fuel.