Chevron DELO 600 ADF 15W40 1 gallon Heavy Duty Diesel Motor Oil is formulated with OmniMax, a Chevron Patented Technology. OmniMax delivers maximum system protection to both the engine and emissions systems. This all-encompassing protection helps drastically reduce DPF clogging, delivering industry-redefining fuel economy retention and extended DPF service life. Delo 600 ADF 10W-30 meets or exceeds current heavy-duty engine oil specifications to provide durability and wear protection of critical diesel engine parts.