The preferred oil is Cat DEO-ULS 10W30. 15W40 is also acceptable. Non-Cat oil must meet Cat ECF-3 or API spec CJ-4. 10W30 is the preferred viscosity. Oil capacity is 19 qts for shallow sump pan and 27 quarts for deep sump pan, including oil filter. Shallow sump pan is stamped steel while the deep sump pan is cast aluminum.