*UPDATE*
We went to lunch... and I told him he was being really stupid, and that he at the very least needed to get insurance.
He showed me the car and explained that he couldn't afford insurance, and he can't afford to get it registered, and he can't afford to get the CV joints fixed(whatever that means) in order to get it to pass inspection.
I explained to him that all that meant that he simply cannot afford to get a car yet. Which I understand his frustration, all these other kids at his school George Washington University, all drive around the BMWs that their mommy and daddy bought them for HS graduation. I then point out if he hadn't of made all the mistakes in the past, like the one he's in the middle of making, he'd have the money for the car, and a stable job to be able to handle the financial burden of owning a car.
He's like fvck that, I want a car, and I've got one. So I give up... You can lead a horse to water but you can't make him drink.