1999 F350 V10 with 156k on motor. I noticed a few weeks back the radiator had what looked like oil mixed in with radiator fluid. Pulled dipstick..oil looks brand new and not cloudy what so ever. I flushed the entire system and replaced with new fluid. Once again oil in radiator resivour. There are no tranny lines to bottom of radiator. They go to remote cooler up front. There were in fact two radiator lines (1") going to the oil filter housing. I bypassed that thinking possibly housing had a crack in it...well still have oil in radiator overflow again. Am I to assume its head gaskets??? If so is it worth just replacing with new motor?? Truck runs flawless and is paid for. I really need some advice on this. Am I missing something? Thanks, Jason HELP