Volvo Repair: Oil (leak) in Turbo, air intake hose, intake runners

Question
Hello Regis,
Sorry I forgot to mention the vehicle in the earlier email: Volvo 940 Turbo.

I have noticed an oily residue in the air hose going from the turbo to the radiator area, and in the air intake hose leading to the throttle body, so I looked into the turbo after removing the hose.  There is a little oil inside at the bottom of the turbo.  What could this be due to?  Thank you.

Answer
I would check that the pcv system is not clogged this is the box under the intake manifold and the plastic piece on top of the box that sticks up between intake runners 3 and 4.if this is ok then it could be fom the turbo.sorry for late answer was unable to access the site for some reason.

Rege