Audi Quattro (differential) noise is being heard while turning the car. The problem was identified to be due to different speeds between the front and rear differential, the locking effect of the center differential can differ significantly in tight bends. -?" unless there is a design flaw, there should be no noise coming from the differential. this is totally unheard of from any car I have owned. Problem was reported to Audi dealership and no definite solution was offered other than changing the oil for the center differential oil and checking to see if the problem goes away. if it does not, they would do further investigation. This is an Audi Quattro differential design fault that can be very dangerous if it fails on highways or under adverse weather or at high trafficked areas. I started an incident case (Reference #06217801) with Audi USA and Regional Case Manager (MR) told me that "our responsibility is to service the vehicles within the parameters of the New Vehicle Limited Warranty. This covers manufacturer-??s shortcomings on parts and labor for 4 years or 50,000 miles (whichever occurs first) from the vehicle-??s in-service date. Once these parameters have been exceeded, repairs do become the responsibility of the owner of the vehicle. Any diagnostic cost would be customer pay." This is why Audi has more class action law suits against them than any other auto brand. Keep in mind Audi has had more class action lawsuit (and lost) against them than any other Auto company. I have received 5 notices of Class Action lawsuit that Audi decided to settle in the last 6 years - just on one model. Needless to say, Audi (VW) puts faulty dangerous products on the road, hoping NHTSA has no appetite to go after them.

- Katy, TX, USA

Car is consuming 1 quart of oil every 600 miles.

- Piedmont, SC, USA

When I was driving and trying to make a right turn to merge into the traffic, the transmission suddenly stalled and stuck in neutral, put my car in the right lane with large traffic on the lane and forced other cars to make sudden stop. After restarting the engine multiple times, it was suspected that somehow the transmission is always in neutral while the onboard system showing it is in driving mode. I had to get out of the car to push it to a safe side road. This is all sudden while car engine is running. Initially the onboard dashboard shows Transmission Malfunction, but after restarting even that error message disappeared, while the transmission is still not engaging.

- Warren, NJ, USA

At times, the "stop-start" system seems to falter when the vehicle has slowed to almost a full stop, but not quite. If I try to accelerate I get a few seconds when nothing happens. I feel that it is either a transmission caught between shifts or an engine falter. I have mentioned this to the dealer, but was told that "that's how it is".

- Aurora, CO, USA

When car is placed in reverse a "P" or park is still displayed in the instrument panel. This has happed several times. Audi service was provided pictures and video of occurrences and they said they would get back to me. They never did. Also now have sos malfunction warning displayed. Car only has 7K miles on it.

- Redmond, WA, USA