I had an issue with my '07 VW GTI (same 2.0T engine) where I got up to an astounding 1qt per 100 mile consumption rate. That's not a typo....1qt every 100 miles.
I ran the gamut looking for the cause. I replaced the turbo itself (thinking seals), replaced entire PCV, ran compression checks (all cyl w/in factory new spec), tried ring soaks to free oil rings, and tried every flavor of VAG approved oil.
Finally I was going to take it in for a ring job assuming that the oil rings were bad (or perhaps the valve seals), either way the engine was gonna get torn down.
But the real solution finally presented itself.....
It was the VALVE COVER itself. Not the gasket, but the plastic cover. Turns out that it is hollow and has chambers and passages that are part of the PCV system. Mine was all cracked and broken internally.
It was replaced and now I do not burn a single drop in the full 5000mi OCI.
More info is in my thread on the Vortex and it links an excellent article from AudiZine on the issue. VW Vortex