Audi R8 2008 Service Training Manual page 20

Engine
Crankcase Ventilation
The crankcase is ventilated through both cylinder heads.
A large settling chamber is located in the oil tank. The
tank acts as a gravity oil separator. A fine oil separator is
connected with plastic hoses behind the oil tank.
Crankcase
Ventilation
Oil Return Feed
6
Oil-Free
Blow-By
Gases
Crankcase
Ventilation
When blow-by gas has passed through the fine oil
separator, oil-free gas can then be delivered to the intake
downstream of the throttle. Separated oil is returned
through the oil return line.
Cyclone in
the Oil Tank