Clarification-
M1 TDT is NOT the same as Mobil Delvac 1.
M1 TDT does NOT have MS-10902/Cummins CES 20081, so it is not an oil that meets all of the specs.
Delvac 1 ESP 5W40 has Cummins CES 20081 along with just about every other builder approval.
Nice discussion on oils. One thing everyone needs to remember. When you see Pennzoil, it is actually just Shell.
Second thing, it is futile to compare TBN from say Blackstone (which focuses on used oil) and a TBN in a product data sheet from an oil blender. The TBN isn't tested the same way...