Hey Trevor. Ahhhh - where in So Cal are you? I am in Downtown SD!
I have now talked with several Audi owners and it seems this is a problem with many Audi's. The dealership did a full test on the oil levels and said everything was normal, even with the dissapearing act. No oil spill/leakage spots under the car either.
I was stumped...
Andrew - from dealer..........
I was copied from Audi regarding your concerns over oil consumption with your 2009 TT.
There are a few situations that could cause this; the most common is a defective oil separator valve.
I'll let you know if this 'fix' helps