There have been a lot of issue with main bearings on this Ram diesel engine. This new 3rd generation Ram engine is 80 % new so it may have solved the issues. What I mean by not built for the 1/2 ton is that it wasn't built specifically for the Ram. The GM/Chev ecodiesel inline 6 was built specifically for the GM/Chev 1/2 ton.
The Ram1500 ecodiesel is a good truck but i just think that at this point, at least in the recent independent tests shown on Utube, the GM/Chev ecodiesel is out performing the Ram.
I am aware of the issues with the engine and by no means am I saying it's flawless. I agree the new 3.0l Duramax appears much better right now, I've test driven one and will probably get rid of my Jeep for one myself if they prove to be reliable. However, I just disagree that any of the Eco issues stemmed from the oil spec or the fact it was "not designed specifically for the Ram" or Jeep.