Golf Gti chewing through oil?

[VWild]

Sorry for the NOOB question, but what is a PCV? And why is boost pressure relevant to the oil consumption?

Thank you Wikipedia:
PCV valve - Wikipedia, the free encyclopedia
The Positive Crankcase Ventilation valve, or PCV valve, is a variable-restriction valve that assists with the continual evacuation of gases from inside a gasoline/petrol internal combustion engine's crankcase