The Audi A6 was a full-sized luxury sedan that was a centerpiece of the Audi lineup for decades. The 2000s A6 has become a staple in the used luxury car segment. From a driving perspective, there were very few cars that drove as well as the A6 did. But there was also the drawback of high maintenance costs associated with the car. The A6 was not the most reliable car on the road, and that only got worse as time went on (via Readers Digest).
The Audi A6 was a car with a lot of potential but the high price was its shortcoming. A full-size luxury sedan was something that many car buyers were interested in, but the older generations of the A6 weren’t particularly reliable. The engine was problematic and so was the transmission.