We seem to blow a turbo every year. Now we have a cracked crank destroyed inner bearing and block damage along with the minor note of metal fragments in the turbo according to the mechanic. A complete loss on a 2008 3500 duramax dually. Less than a month after the 5 year power train warranty had expired. Any suggestions why this happen. the vehichle was maintained by the dealer and had all the periodic service work done to it? It does pull a trailer at the top of its weight rating