Basically FCA does not care what happens to your DPF post warranty.I don't know. I do know that oils like the Valvoline Euro 5W40 are low SAPS oils that are better for the DPF system. But as far as the technical differences that could cause coking on the new water and oil cooled turbo system or the new dual-pressure EGR system, I really don't know.
Here's the specific response a FCA representative posted to the forum. There were a lot of questions because the very first Gen 3 EcoDiesel owners manuals had the old oil spec info AND the new oil spec info in the same manual and it caused a lot of confusion. Keep in mind this new engine is 80% different from the old one in the 2019 and older trucks. The manuals have since been updated and now only show the FCA MS-12991 and API SN specifications.
I do apologize for the delay in my response, as I was awaiting a follow up from our engineering team on this matter. I have been advised that diesel oils like Shell Rotella should not be used as they will cause turbo coking and associated concerns as this engine has lower engine pressure than previous generation engines. Please know that the Pennzoil Platinum Euro has moved to SN+ with new formulation and it has not been validated. There are plans to test the Pennzoil Platinum Euro SP grade oil as soon as the virus situation progresses. Please do not hesitate to reach back out down the road, as I am happy to provide any additional updates I can.