A 2020 Freightliner Cascadia with a Detroit DD15 takes 38 quarts (9.5 gallons) of 10W-30 CK-4 engine oil at every service. This is the Gen 5 spec; pre-2020 DD15 Cascadias take 40 quarts. Always confirm against the engine label on the rocker cover, since Detroit ran running changes within model years and the 38 versus 40 quart split can vary on a transition-year truck. Use a CK-4 or FA-4 rated oil per the operator's manual; running anything older than CK-4 risks DPF and SCR catalyst damage from sulfated ash. Filter element capacity at service is roughly 0.4 quart held in the filter housing, so net oil change including filter typically lands at 9.5 to 10 gallons. For the matching DD15 oil and fuel filter program at wholesale, browse the Steinberg Detroit DD15 collection below.
Browse the Detroit DD15 / DD13 / DD16 Filters collection →