Chevron Delo XSP 15W-40 Heavy Duty Synthetic Diesel Motor Oil with ISOSYN Advanced Technology is a mixed fleet engine oil recommended for naturally aspirated and turbocharged four-stroke diesel engines and four-stroke gasoline engines in which the API CK4, API SN or API SN PLUS service categories and SAE 15W-40 viscosity grade is recommended. Delo 400 XSP SAE 15W-40 is an API CK4 heavy duty engine oil specifically formulated for on-highway and off-highway applications, including 2017 greenhouse gas-compliant diesel engines with lower CO2 emissions and improved fuel economy, as well as EPA 2010-compliant low-emission diesel engines with Selective Catalytic Reduction, Diesel Particulate Filter and Exhaust Gas Recirculation systems. It is fully compatible with previous engine models and previous API oil service categories. Prefer to do your automotive oil change service at home? Trust Chevron car oil synthetic blends to keep you on the road. Chevron synthetic motor oil, large engine motor oil, synthetic high mileage blends and others are available to keep any car running smoother, longer.