With Expertise Built In™, the OTR SAE 15W-40 Heavy Duty Diesel Engine Oil is a superior motor oil, formulated to meet or exceed 2017 model year on-highway and Tier 4 non-road exhaust emission standards, as well as previous model year diesel engines. This heavy duty motor oil also has exceptional bearing corrosion protection, which is critical for Exhaust Gas Recirculation (EGR) engines. FleetPride is your First Click in Heavy Duty®.