It's hard to tell sometimes. Sometimes you get lucky and the tuner will put a sticker on the ECM. Also, perhaps someone will chine in here with tuning that can hopefully shed some light on those characteristics can lead you down the right path..
Welcome to the forum.. no one really knows if you got a "good one". I recommend just driving it and enjoying it, especially since you have that factory warranty!
Depends on the dealer for loaner, it seems 50/50 if they give you one. But yes, sounds like you lost a motor as you've already found out likely. Keep us updated on the dealers findings!
Welcome to the forum. Check out this thread for oil change information:
https://www.ecodieselram.com/forum/threads/ram-ecodiesel-oil-change-information.318/
I love it.. it's similar to the EcoDiesel as far as power I feel like, but it for sure a more reliable motor at this point. The reported issues so far are pretty minor electrical gremlins.
I'm averaging 26 MPG overall.. very similar to the EcoDiesel. Some 2wd drives do better (I'm 4x4), and if...