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I'm no expert....but as i understand it:
(a) replace the seal which fixes the leak - the oil vapour will continue on its way to the combustion chamber. The vapour should'nt clog as you have returned the system to how BMW intended - you will always get a little oil collecting when the system is cold and the vapour condenses.
(b) ignore the leak - the leak is evidence that the boost pressure is leaking out, therefore reducing engine efficiency and power. The longer you leave it the worst this will get until you have a noticeable power drop.
Hope this helps.
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