U1P-Duty SAE 15W-40 Synthetic Blend 5 Heavy-Duty Motor Oil, API CK-4/SN, is formulated with a blend of conventional and synthetic base oils, combined with a premium additive package to deliver superior performance and protection. This oil is designed for use in high-speed, four-stroke cycle diesel engines built to meet 2017 model year on-highway and Tier 4 non-road exhaust emission standards, as well as in older diesel engine models. It is especially effective in maintaining the durability of emission control systems, including those equipped with diesel particulate filters (DPFs) and other advanced after-treatment technologies.

U1P-Duty SAE 15W-40 CK-4/SN provides enhanced protection against oil oxidation, shear-related viscosity loss, and oil aeration. It also defends against catalyst poisoning, DPF blockage, engine wear, piston deposits, thermal degradation at high and low temperatures, and soot-related viscosity increases. In addition to meeting API CK-4, this oil exceeds the performance requirements of API CJ-4, CI-4 with CI-4 PLUS, CI-4, and CH-4, making it suitable for engines requiring any of those service categories.

Note: When using this oil with fuels containing more than 15 ppm sulfur, consult the engine manufacturer for proper service interval recommendations.


For additional information on this product, please see the Product Documents section for all downloadable user manuals, installation guides, brochures and warranty statements.