Ignix Predor Max Synthetic Blend Heavy-Duty Engine Oil, SAE 15W-40, API CK-4/SN, is formulated with conventional and synthetic base oil and a premium additive package. This oil is designed for use in high-speed four-stroke cycle diesel engines designed to meet 2017 model year on-highway and Tier 4 non-road exhaust emission standards as well as for previous model year diesel engines. It is especially effective at sustaining emission control system durability where particulate filters and other advanced after-treatment systems are used. Ignix Predor Max SAE 10W-30 and 15W-40 Synthetic Blend Heavy-Duty Diesel Engine Oils API Service CK-4/SN provide enhanced protection against oil oxidation, viscosity loss due to shear, and oil aeration as well as protection against catalyst poisoning, particulate filter blocking, engine wear, piston deposits, degradation of low- and high-temperature properties, and soot-related viscosity increase. In addition to API CK-4, this oil exceeds the performance criteria of CJ-4, CI-4 with CI-4 PLUS, CI-4, and CH-4 and can effectively lubricate engines calling for those API Service Categories. When using this product in conjunction with fuel containing higher than 15 ppm of sulfur, consult the engine manufacturer for service interval recommendations.