[mikesride]

My 82 3.0l was doing similar things and on the advice of the local Porsche guru up here all I did was remove the "vent" line from the oil tank. There is a valve in there that seems to act like crankcase ventalation or something. ( does anybody know what its called and what it does?) I cleaned it out with brake clean and the smoke show stopped right away, oil pressure (on dash gauge at least) improved and the cars idle even got smoother. I don't know much but hope this helps you.