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Keep your engine running at its best with Exa Lube 15W-40 API CI-4 Engine Oil, designed for both light and medium-duty diesel-powered vehicles, including commercial vans, pickups, and passenger cars. This high-performance lubricant offers the perfect balance between durability and engine cleanliness, providing enhanced wear protection, oxidation resistance, and longer engine life. Formulated to meet the stringent API CI-4 specification, this oil is ideal for engines fitted with EGR (Exhaust Gas Recirculation) systems and is backward compatible with older diesel engines. The 15W-40 viscosity grade ensures smooth starts in colder temperatures while maintaining excellent lubrication at higher operating temperatures.