2017 6.4 4x4. 105 K miles.
Been using PUP,0w40, at first, changed to RL 0w40 at 40K. RP filters,and Bio Lubegaurd.
I have done 18 oil changes, last at 104K.
Blackstone reports, were always great, last one was at 85K.
Now out of warranty,at 90K.
CEL came on, not flashing, running a little...