I am looking at a 2010 f350 xlt. Truck is nice shape but has valve covers and some of valve train pulled apart on it. The truck has 132k and still has working dpf and everything. It's a car lot who has it. I asked what it was tore apart and they said the previous company who had it took it to ford garage for a engine noise. They tore it down that far and then before getting anything fixed on it they traded it in along with the rest of there fleet of trucks they had. Any ideas what could be wrong at all? The car lot don't know what would be wrong with it.