this is my first audi, but when i'm idling, at about 750-850rpm, there is a very low frequency vibration. i can hear/feel it as i drive as well. it almost feels like a transmission problem? i'm not sure. i've literally driven the car 150 miles, and it seems to be getting worse. taking it back to dealer tomorrow, but i'm not under factory warranty, and i haven't purchased an audi extended warranty yet. plus, i didn't buy it from an audi dealership. ha.
it's a 2010 premium plus, 3.2L with 45k miles.