Actually Champaign is right on the money.
The kid not only super overheated the car, he damaged the front axle so bad, the control arm is bent.
So you have 2 major issues:
1.) The engine - repairable, but it will be expensive
2.) Drive train issue - once you bent the suspension components, no matter how you try to fix it, the car will be NEVER the same (unlike a rebuild engine), it will not drive the same. I can go as far and predict an almost uncurable shimmy, which you will correct, only to have it come back after a while.
I would have NEVER entrusted the youngster with this car. A 10-15 year old Kia or Hyundai would have sufficed until he learns how to drive and how to take care of a car.
Another e39 down.
Looking for a DIY? Parts? Check this out, it might be your ticket
TMS underdrive pullies - Stewart WP - PSS9 - Beisan Vanos seals - Zimmerman cross-drilled & Akebono Euro - Deka 649 MF - 55w HID headlights - 35w HID foglights - Hualigan double din - ACS (rep) alu pedals - Euro central storage console - Breyton Magic Racing staggered wheels - M5 bumper - M5 steering wheel - Tint
Stable: e39 M54, e53 N62 & Tribby