My 2022 UOA :(

[06 Dodge]

Shell has lots of info out there of what there base number for new Rotella T-6 5w40 and that number is 10.2, most manufactures have report sheets or PDF's on what the base number is for there oil's...

 

[AH64ID]

Shell has lots of info out there of what there base number for new Rotella T-6 5w40 and that number is 10.2, most manufactures have report sheets or PDF's on what the base number is for there oil's...

For the current oil that’s correct. Depending on how long ago you started running and testing T6 it may have been different. CJ and CK spec were probably the same, or very similar but anything older would have had a higher starting TBN. It likely was all CJ or newer, but i don’t know how far back you started running it.

 

[06 Dodge]

I started using T-6 in 08 in my 5.9 stopped in 21 when I did its last oil change before I sold it ( last UOA on 5w40 was I think in 2017 ) I then used T-6 by accident in the 22 in late fall of 22, its currently running Amsoil 5w40 ADO so hope it does better, a few people have suggested running 10w30 but don't know to much about the newer 10w30 synthetic, I do know how well 5w40 did in the 5.9 and have read its done well in several 6.7 HO engines, but I'm also learning this 6.7 is a whole new animal, so I will have to do a lot of reading and asking lots questions....

 

[AH64ID]

I’m also running Amsoil ADO, but haven’t done any UOA’s on it.

In 08 it’s likely you were using CJ spec oil.