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Take the front cover off the turbo (the aluminum outlet side) and look at the impeller wheel and around it to see if the seal is leaking oil. If not, I would just pop the rest of it apart, clean up the unison ring and center housing for carbon, slap some anti-seize on al the bits inside that move around, and toss 'er back together.
There is generally oil carryover into the intake side of the engine from the crank case vent that enters the turbo inlet tube.
A lot of guys do...I can't remember what it's called... CCV bypass, or something. Apparently this keeps the sludgy crap from ending up in the turbo, charge air cooler and intercooler tubes.
Ford Senior Diesel Technician
2008 F-350 4x4 Off Road 6.4 Powerstroke Diesel
There are strange things done 'neath the midnight sun by the men who moil for gold.
The arctic trails have their secret tales that would make your blood run cold.