Full Synthetic oil in 2016 Dodge diesel

Grit dog wrote:
^Let me explain this as I would to my son before he learned that everything isn't 100% literal. He grew out of that a couple years ago.
Yes you're correct, DEF never touches the engine nor is it used in an active regen.
What it does is allow for less regens which in turn lessens fuel dilution by way of not injecting extra fuel to raise egts. (Except systems like GMs I believe that use an additional fuel injector downstream of the engine ) Also the newer technology has allowed for less egr action which keeps oil cleaner as well.
BTW if you weren't being sarcastic you wouldn't have stated the "question" as you did followed by the little scratchy head emoji.

So from my 9 year olds perspective, yes def is not involved in regens. From an informed perspective, def is beneficial in multiple ways to the Diesel engine emissions system.

And from the RAM truck prospective it was a mayor change in the tuning of the engine as you note. I used the term NON DEF engines and that seem to have confused him. Anyone that closely follows the RAM trucks understands this turning point, which occurred later than the GM's and Ford's.

Chris