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ICQ>
I don't know how much oil you are finding in the intake tract of your 850, but if you are not an aggressive driver there will be some accumulation. Let me explain:
The rings have a small percentage of leakage (.5-1.5% would be usual amount) that creates some crankcase vapor outflow that has to go somewhere. That somewhere is through the crankcase ventilation system that sends these vapors first through a maze that should allow the largest portion of condensable oil to drip back into oil pan and the remainder, which includes some condensable oil, goes back to the closest non-pressurized area in the intake. This location is the inlet pipe going into turbo housing. The vapor mix goes from there through turbo, intercooler, and then into intake manifold and then into combustion chamber. At the turbo inlet hose you might find oil that has collected there at the rib adjacent to clamp and maybe on the aluminum housing where it will run down and might even drip off. The other place where oil may be in evidence is at the water drain hole on intercooler (placed there to allow condensed water vapor to run out in cold, damp climate operation).
Why does driving non-aggressive make this happen?
The oil vapor condensables will go through under some force and velocity if you are heavy-footed and won't "puddle" and run out somewhere, whereas slower driving (maybe not of your choosing if you are driving in commuter traffic a lot) will allow this to occur.
Replacing/rebuilding your turbo may not get rid of this oil residue if you really don't have a failed turbo.
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