TL*THE CONTACT OWNS A 2004 FORD F-350 SD. WHILE DRIVING 20 MPH, WHITE SMOKE WAS EMITTED FROM THE TAIL PIPE. THE CONTACT UNHOOKED THE TRAILER, BUT THE VEHICLE WOULD NOT MOVE REGARDLESS OF WHAT GEAR IT WAS PLACED IN AT THE TIME. THE VEHICLE REMAINED IN PARK FOR FOUR HOURS BEFORE IT WAS FINALLY ABLE TO BE MOVED. A FEW DAYS LATER, THE VEHICLE WAS DRIVEN TO A NEARBY REPAIR SHOP AND THE MECHANIC STATED THAT THE EGR COOLER SYSTEM WAS DEFECTIVE AND COULD HAVE BLOWN A HEAD GASKET. THE DEALER WILL NOT ASSUME RESPONSIBILITY FOR THE REPAIRS. THE VEHICLE HAS NOT BEEN REPAIRED. THE CURRENT AND FAILURE MILEAGES WERE 125,000.