Ok so I have a friend who has an 05 F-350 dually and the turbo was went out. Mileage was little over 70K and he wasn't to worried about it because it was still under warranty. He goes to pick it up expecting to pay the $100 ded. and they said no need. The turbo was replaced under the emissions warranty? What the heck is that? Saved him some money, just wondering if anyone new how this worked?