I have a '15 ED, with 71,000 miles. Of that I have towed 6,500 lb. travel trailer over 13,000 miles. I have covered all of the western States, north to south and back.
Arizona has some interesting roads into and out of Phoenix.
I went north on 17 to Flagstaff with no major issues. If you get a new one at least get a Laramie with the engine monitoring option, so you can scare yourself on oil temperatures. In the cold of morning north bound it is normal to see 265 degrees on oil temperatures, even a flash of 270 on the tougher grades.
It is designed that way to evaporate the diesel out of the engine oil. The computer pumps diesel into every exhaust stroke in the engine to light off the emissions exhaust system, for those of us that stayed with the stock system.
So far, I have never had a dash light tell me any warning about anything, I figure it is because I live 14 miles outside Olympia, in a rural environment.
Every time I go somewhere, the system gets well exercised, heated to operating temperatures in every way, regeneration of the exhaust just happens normally.
I get about 8,500 miles out of the DEF tank. I refill DEF at the Pilot station half way to Olympia, when I need about $5.00 worth, half a tank.
Somewhere in this forum there is excellent reading article from an Amco engineer about diesel in motor oil. He explains why it is done by design, and how oil viscosity(yah spell check) is designed and maintained at higher temperatures.
Other places in this forum cover the Engine top end issues. Fiat has determined they can put the overhead cam shafts and sprocket drives together without a "key" by hot / cold pressure construction.
Guess what, some fail. The exhaust sprocket tends to spin on the valve shaft/cam. That they replace the engine up to 100,000 miles on warranty is nice.
My question is why not design for the long haul with a keyed sprocket. Even cheep skate Henry Ford did it in model "T's".
I see people changing oil before 10,000 miles. Some with testing go further. Why, to both?
FCA, has issues, but they back their motor. I have had good luck so far so I feel the need to continue as they ask.
My concern now is antifreeze. What is the recommended change interval. Is anyone out there using the new nonwater based coolant, Evans, is the brand name? I am very interested.