I will post my UOA numbers tomorrow but I just dumped the T6 in my Cummins diesel at over 18K. Almost no change from 11K when I just sampled and no change (iron went from 19 to 26). The TBN was 5.86 (no change from 11K). Viscosity 14.6 cSt @ 100C.
I'll give 1/3 of the credit to Cummins making a great engine and 2/3 to the T6 oil. I will cut open the Bosch D+ filter, it went the 18K.
2015 Subaru Forester 2.5 engine/CVT PP & M1
2001 Jeep Grand Cherokee Laredo 4.0 - PP & M1
1999 Dodge Ram 2500 w/Cummins - Rotella T6 & M1