Diesel Supreme Ultra 15W40 oils are formulated for extended drain service in the most demanding applications requiring API Service Category CK-4, as well as the latest OEM’s (Original Equipment Manufacturers). DS Ultra 15W40 meets the needs of today’s high-performance, fuel efficient, low emission diesel and gasoline engines, has advanced corrosion protection, enhanced oxidation stability, valve train wear and deposit control and excellent protection of modern engines in addition to older models
