Ouch! Sorry to hear that! Probably some tard drove it who thought it was cool seeing all the black smoke and didn't know that the black smoke = sky high egts and melts pistons. That or he didn't give a ****. Obviously you have good mechanical skills so it would probably cost you more to get a lawyer than rebuild it yourself. I would go to the dealership and pay a visit to the owner. Find out who drove the truck and make sure that bastard gets fired. If he doesn't know what thick black smoke and egts are, he's not a diesel mechanic. If he is a mechanic, I'm sure hes seen a few melted diesels from dumbasses throwing edge juice programmers running extreme setting with a stock exhaust....... meltdown city. Therefore, it should be neglect on the dealership for letting "scooter" take a drive in a customers truck, or the mechanic being a freakin moron. Good luck. keep us posted.