Nothing.
I have had the car for a little over a month now and I love it... I would recommend and Audi of any style to anyone. they know what they are making and just by driving one you will know what I am talking about. car handles amazing and the all time drive is something that just makes you feel safe. and the tons of safety things that makes this car has is amazing. it is so qutie inside, and i dont see anything happening to engine or drivetrain for a very long time...
I appreciate the comments, however, come back in 1-2 years and let us know what you think. Even a Yugo can go a month without a glitch.
440 000km NO ISSUES with supercharger!