Chevron Delo XSP 3G 15W40 (2 Pack, 6 Quart Smart Change Boxes) Heavy Duty Synthetic Diesel Motor Oil with ISOSYN Advanced Technology is a mixed fleet diesel truck 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 with ISOSYN Advanced Technology 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. In addition to EPA 2010 compliant low emission diesel engines with Selective Catalytic Reduction, Diesel Particulate Filter and Exhaust Gas Recirculation systems. Chevron synthetic motor oil is fully compatible with previous engine models and previous API Oil Service Categories. Used to buying motor oil gallons? Get your oil in Smart Change boxes, no need for additional containers or funnels with glug free pour.