Kirkland Signature Heavy Duty Diesel 15W40 Synthetic Blend is a premium multi-grade SAE 15W-40 engine oil designed specifically for diesel engines. This synthetic blend formula is API CK-4/SN rated, making it suitable for all diesel engines including modern low-emission engines.

The oil is engineered to enhance engine durability by providing superior protection against wear and corrosion. It helps maximize engine life by maintaining optimal viscosity across a wide temperature range, ensuring consistent lubrication and protection in both hot and cold conditions. The synthetic blend formulation combines the performance benefits of synthetic oil with the value of conventional base stocks.

Manufactured and packaged by Chevron, this product comes in a convenient 3-count package with each jug containing 1 gallon (3.785 L) of oil. The 15W-40 viscosity grade is ideal for heavy-duty diesel applications in trucks, commercial vehicles, construction equipment, and agricultural machinery.