Fleetguard® CC36155 ES Compleat OAT/PG Platinum is a Life-of-the-Engine 1,000,000-mile coolant. This nitrite free Organic Additive Technology/Extended Life Coolant technology is compatible with silicon seals and is our most versitle coolant for use with Light-Duty and Heavy-Duty Diesel applications as well as Natural Gas and Gasoline powered applications. Due to ease of maintenance and compatibility with many system contaminates, nitrite free OAT technology (like ES Compleat OAT) is the preferred technology of most OEMs.