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Originally Posted by FCobra94
Topping up oil? Where do you think all that oil would have ended up otherwise, back in the crankcase? lol
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yes thats the whole point of the cyclonic seperator in the valve cover..... to separate the heavier oil particles and return them to the crankcase leaving other contaminants which get pulled into the intake and removed/consumed by the engine.
From another post on here:
"Cyclone Separator
A cyclone oil separator is used in the N54 engine. Here, four of the described cyclones are integrated into the oil-separator housing. The oil mist drawn in from the crankcase is set into a spinning motion in the cyclone. As a result of the centrifugal forces, the heavier oil settles on the cyclone walls and from there drips into the oil drain. The lighter blow-by gases are sucked out from the middle of the cyclone. The purified blow-by gases are then fed to the air-intake system."
It's not perfect by any means but it does work.