PETRONAS Urania Prime Classic 15W-40 is a premium heavy duty engine oil formulated with StrongTech™ technology, that forms a uniquely strong fluid film to protect the engine, retain performance and keep trucks running and available for longer periods. This helps to reduce the total cost of ownership. Suitable for older generation heavy-duty diesel applications including turbocharged and naturally aspirated diesel engines, both on-highway and off-highway, where API CF-4 is required.