If you have an apple device (iPhone or iPad) you can go to "quickserveonline" and download the app. Once you open the app just type in your engine serial number and it will tell you everything about your engine, when and where it was made, part numbers, fault code analyzer etc..and the oil capacities. Gary is correct, some Cummins engines have different oil pans for the same engine and it lists the capacities for both.
On my M11 it lists the regular oil pan at 8 gallons, the deep oil pan at 9 gallons. That is just the oil pan capacity...then you have to figure out how much your filters will hold. Once you figure all this out you can calibrate your dipstick. Some are off!
2000 Foretravel U320 4010
Cummins M11 450hp
Allison HD4060R 6 Spd W/Retarder
Bruce & Teresa