That 2nd gen EcoD was notorious for spinning bearings. It's an Italian-made engine that initially spec'ed a 5w30 oil but FCA then changed that to 5w40 CK4 rated oil (and the CDJR dealers started using Rotella T6 for service) in order to get those engines thru the powertrain warranty.
I would've asked if there were any DTC/CEL trouble code(s) set, and if so, which ones. Misfueling happens, and sometimes they put the wrong stuff in the wrong tanks at the fill stations; been there done that and replaced an entire fuel injection system for about $15K once before. Luckily it was all covered by insurance under comprehensive.
Looking forward to finding out more, but fingers crossed they didn't spin a bearing or two...