Audi A6

The Audi A6 nameplate first appeared in 1994, replacing the long-running Audi 100. As Audi's executive-class contender, it has consistently offered advanced technology, all-wheel drive, and sophisticated styling. While standard A6 sedans and wagons are capable daily drivers, they don't typically attract collector interest. Instead, enthusiasts focus almost exclusively on the high-performance S6 and, most importantly, the RS 6 variants.

The RS 6, particularly in its Avant wagon form, is the A6 family's halo car. Early C5 generation models with their twin-turbo 4.2L V8s are modern classics, but it's the later generations that command the most attention. The C7 RS 6 Performance and the current C8 RS 6 Avant are celebrated for combining supercar-level acceleration with the practicality of a family wagon, a formula that has proven irresistible to many collectors.

The market for the A6 is incredibly broad, reflecting its 30-year history. Older, high-mileage sedans can be had for very little, while the latest, highly optioned RS 6 Avant models trade for well over $200,000. The average sale price of around $35,000 is heavily skewed by the volume of newer, non-performance models, while the top of the market is defined entirely by the rare and powerful RS 6.

Prices range from $100 for early project cars to over $256,000 for recent, top-spec RS 6 Avant models.