[FED 387]

Radiators cracking are/were a problem with 6.0-6.4 and maybe 6.7 vehicles---I found oil rails to injectors get clogged as the injectors work off oil pressure-any particles clog up the screens in the oil rail--YOU ABSOLUTELY MUST CHANGE OIL & OIL FILTER AT LESS THAN 5000 MILES!!!!!!!!!! Regardless of what the owners manual says(7500 miles) and you must use an antifoaming engine oil too---If you do not change the oil you are asking for catastrophic engine failure---the injector cloggs up refuses to work the engine runs lean the temp goes up and the head gasket then fails dumping water/antifreeze into the engine--next Kaboom!!! also found out these are zero tolerance engines like some of the other Ford gas engines---ya cannot surface the head cuz there is not gonna be enough clearance in there and parts start hitting each other---comp 387