LOCOMOTIVE POWER 15W-40 CK-4 is an advanced performance low-SAPS diesel engine oil designed to provide excellent protection in both modern and older heavy-duty engines. It is formulated with advanced additives to enhance wear protection, reduce oil consumption, and maintain engine cleanliness. This oil meets the API CK-4 specification, ensuring optimal performance in demanding operating conditions and under extreme temperatures. Ideal for a wide range of diesel  engines, it offers superior oxidation stability, corrosion resistance, and fuel economy benefits.