Oil in inlet manifold

[Bandycoot]

Happy new year chaps. I've just taken the inlet manifold off my S8 to have two throttle body bolt holes helicoiled and have found oil in the there. It's not a huge amount of oil but enough to have me concerned. I've noticed there has been an oil leak for a bit of time and replacing the cam cover gaskets didn't help much. I did a compression test a few weeks ago and the readings were perfect, the highest reading was 14 bar with the lowest 13.something. The only conclusion I can come to is the crankcase breather is blocked somewhere. Any thoughts from you chaps and what I can do about it?

Thanks guys.

Steve