The SMITTY'S SUPPLY SUPER S chevron SAE 15W40 CK-4 engine oil is engineered for superior wear protection that reduces engine wear and extends engine life. This formulation offers excellent oxidation stability, aiding in keeping engines cleaner. It features advanced soot control, specifically designed to enhance performance in diesel engines. Suitable for a wide range of heavy duty engine types and applications, it provides enhanced corrosion protection, minimizing rust and corrosion in engine parts and efficient functioning of its engine.