I am in the same boat with my Treg. I can see the new gasket is oil free but still have a minor leak but must admit the half rounds were not replaced. I found a post on the Audi forum where the owner stated the same problem and had good results after replacing the PCV valve with a new OEM valve. According to him the aftermarket valves are dodgy. I had a spare aftermarket valve that I installed and want to say the leak is less but still there.