Requesting source for PCV system diagram



Hi, I have a 2003 Audi Allroad (2.7T) with 110K miles. The car runs well, however it is beginning to leak oil through its timing gear seals. I’ve been told that I should inspect the PCV system for clogs as an unvented crankcase is a more common cause for leaks through these seals than the seals themselves being worn.

I’ve been looking for the pcv valve but nothing appear too obvious. Unfortunately the Bentley manual does not have a section or diagrams describing the crankcase ventilation system.

Might anyone know a source where I can find an explanation or a diagram of the PCV system for the 2.7T motor?