2013 Audi A6 2.0T Premium quattro 4dr Sedan AWD (2.0L 4cyl Turbo 8A)
I own a 2013 Audi A6 2.0T. The vehicle was defective from day 1. While I love the car overall, one big watch out is an issues with MMI equipped cars with their standard sound system that intermittently sends a very loud, starting boom noise. The sound will cut out for up to a minute and then play normally until the next time. It can happen infrequently or several times in a day.
If you are considering purchasing this vehicle beware of this major, unresolved issue. I have heard that several other models have the same issue. Audi stalled on acknowledging the issue for about 6 months and still does not have a fix. It is believed to be software related.