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I think you will always find some oil residue inside the tubes as some oil/air vapour will precipitate there even if the aos is functioning normally. Since you don't have a big vacuum problem at the oil cap and no great clouds of white smoke, I wouldn't worry too much.
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James now has: 2008 987S 6 speed
Crashed: 2010 987.2 pdk in speed yellow! 
Sold to a cool racer chick: 2004 986 S
YouTube channel: the PORSCHE as seen by NewArt
www.youtube.com/channel/UCohdrH2xHTklM1thxk0KKOQ?
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