Wynn's Heavy Duty Concentrate for Engines is a blend of scientifically formulated compounds such as corrosion inhibitors, oxidation inhibitors, detergents/dispersants and acid neutralisers combined with the unique Wynn’s Friction Proofing Package. They collectively form a product capable of reducing maintenance costs by improving engine cleanliness, reducing wear and providing extremely high levels of protection, beyond the capability of API-CH4 performance.