Is it something that needs swapping, mines looking abit greased up ?, what does it do I'm guessing its not what i thought it was like a basic breather or oil separator..
Lol, seems its this? Now I have had oil leaks from the filter and maybe that's the weakest link in the chain think I'll swap it for the sake of a 20note..
The mother in laws 1 series BMW drinks oil as discribed in This link maybe this is the cause or their petrol version of it..