Motosel SAE 15W-40 CK-4 Premium Heavy Duty Synthetic Blend Diesel Engine Oil. This oil is designed for 2017 and newer on-highway and Tier 4 exhaust emission standards, offering enhanced protection against wear, oxidation, and other issues. It's suitable for naturally aspirated, turbocharged, or supercharged diesel, gasoline, or propane engines in trucks, SUVs, and passenger cars.