FWIW, I ended up getting a cummins. I have a 2016 ram 3500 now. I am still not sure whether there is a real concern or not with the ecodiesel, but I am getting 23 MPG with my cummins thru 8k miles, and that is perfectly acceptable for me.
"Best-in-Class 15,000-mile oil change intervals" may have something to do with that too... perhaps not in the specific cases that you know of, but on average... IMO following that advice would be pure folly.... I know Land Rover for a while kept saying the same things and people's trucks kept...
Part of what makes me so indecisive with the Cummins is that so many people tune the heck out of them and push those things a lot harder than they should, so I don't know how widespread issues would be if all kept closer to stock specs and just messed with less risky mods. I'm not interested in...
Yeah, I know... I've read about a lot of issues with the newer 6.7 Cummins... though at least they seem to have a bit better emissions design now... many people were having DPF failures way sooner than they should but I've read that since '13 it has been much improved, along with the mileage...
I have been reading up on this ecodiesel engine trying to get enough information to decide whether it would be wise to get one of these trucks or pay extra for a 2500 and get the Cummins. I've been helped a lot by what Shawn has shared, and I'm pretty sure there is enough information available...