Welcome! Buying a used vehicle, maintenance records are always a plus, but for a EcoDiesel it's a must. Most folks don't have any problems and are over 100K.
Continue to read around.. you'll find different opinions, but remember most folks sign up on a forum to complain.. not brag. :)
Enjoy...
In my opinion. Consider yourself lucky they are doing it out of warranty! Welcome to the site.
I'm not sure on your warranty question. Maybe someone else can chime in around that.
Oracle lighting Halos looks like to me. I installed a set in a Camaro SS, and it wasn't easy! Welcome to the forum!
Many lighting companies out there do this, but they are pretty expensive. Here is one: https://www.dezertlighting.com/collections/dodge-retrofit-kits
It would have to be programmed via a engine tune. But, you can get an external monitor (I think Edge CTS2 does this) to start a manual regen process.. say you're headed on a freeway trip, and then kick it off..
50K on factory tires is a lot of miles.The factory tires just suck.
You're other concerns are valid.. The famous "oil in coolant" is pretty common it seems, although we haven't had many signup lately and state that one.