Since the day I have bought this truck used, it has had a rough idle and rich smelling exhaust. Finally tracked the problem down to the well known pcv valve location, which has a tendency to pull oil vapors our of the filler neck and allow them to flow straight into the air plenum, where the map sensor gets a nice coating of it. I have tried the home made catch can for the pcv line with little luck, I have tried cleaning everything several times, I have changed the pcv valve, even tried running engine restore to thicken up the oil thinking it might be blow by causing the vapor...but nothing has worked. As of right now, I have Rotella T-5 10w-30 with about one quart of marvel mystery oil in case I might have a stuck oil ring somewhere. I see they do have a pcv upgrade kit to relocate the lines, but not many people seem to have the same exact problem I have. While watching the engine idle, I noticed right away with the oil fill cap off the oil vapors were coming out slow but steady. I dont recall seeing this on many engines, unless they were old and bad off. I don't have any coolant in the oil, and the vapors never stop, so its not like its just burning off moisture from overnight. If I switch to a full synthetic, would the vaporing stop? I just want the engine to run like it should without oil migrating into the intake. When the map sensor is clean, the engine runs perfect...even did a power balance test and every cylinder is hitting the same. Just wondering if I am missing something cause of the oil I am using. Castrol has done it, valvoline and supertech have as well...so I need advice!!!!