Volvo Repair: smoke on 94 850 turbo, pvc type, squirt bottle

Question
i recently purchase a 850 turbo 94, it has 120000 miles. Ijust did a small tune-up(plugs, oil+air filter and new oil). When the car is idling for a little while and you give some gas, the car will make a little cloud of smoke( but not when idling). I checked the tube between the turbo and the intercooler and there was a little bit of oil. I took the intake out before the turbo to check the turbo shaft and it had some play.On that air intake there is the return of the PCV line and a valve?! which was very dirty on the inside of the intake, could smoke or oil could come this way? Could it be piston rings or valve seal? and how can i figure this out?. I was going to rebuild the turbo but, does the smoke come from it?!! If you could give your input i would really apreciate
Thanks!

Answer
Hi Francois,
          On the out side of the turbo you can find PVC type stuff....but never to the level as to create smoke...out the tailpipe.
               If it is rings( I doubt it..you can do a compression test...write down the results..read all of them with out any plugs in...then...read them after you squirt about 2 table spoons of 30# oil...use a 99cent squirt bottle.. into each cylinder one at a time...use lots of crinkled newspaper to catch the oil that will fly..you'll see...if the compression climbs by more than 20%...you might be needing some attention in the piston ring dept.
      The turbo might have oil related problems but they would not put oil into the engine...with such a clean intake area.
         I'm not sure how to test for valve seal failure.

        Good luck,
                   Bilbo