Chevron Delo 400 SDE SAE 15W-40 Heavy Duty Diesel Motor Oil with ISOSYN Advanced Technology is a heavy-duty engine oil recommended for naturally aspirated and turbocharged four-stroke diesel engines and four-stroke gasoline engines in which the API CK-4 or SN service category and SAE 15W-40 viscosity grade are recommended. Delo 400 SDE 15W-40 is also backwards compatible with diesel engines in which the API CJ-4 CI-4 CI-4 Plus and CH-4 service categories are recommended. Delo 400 SDE SAE 15W-40 with ISOSYN Advanced Technology is an API CK-4 heavy duty diesel oil specifically formulated for 2017 greenhouse gas (GHG 17) compliant diesel engines designed to meet lower CO2 emissions and improved fuel economy in addition to EPA 2010 compliant low emission diesel engines with Selective Catalytic Reduction (SCR) Diesel Particulate Filter (DPF) and Exhaust Gas Recirculation (EGR) systems. It is fully compatible with previous engine models and previous API oil service categories. Available near the aisle for auto parts motor oil from Chevron is always good to have on hand.