Used Audi S6 for sale in Europe

About the Audi S6

The Audi S6 is the performance version of the Audi A6, an executive car sold mainly as a saloon and as an Avant estate. It pairs quattro all-wheel drive with a stronger engine, firmer suspension and sportier trim than the standard A6. It suits drivers who want the space and comfort of an A6 with extra performance.

Engines have changed a lot over the years. Early cars used a turbocharged five-cylinder petrol engine, followed by V8 and V10 petrol units. The 2010s brought a twin-turbo V8, and later cars moved to a mild-hybrid diesel V6. Automatic gearboxes are common on later cars, while some older cars were sold with manual gearboxes.

Listings span many model years, so condition and specification differ widely. A battery-electric S6 e-tron, based on the newest A6 generation, now exists as well. Check which generation and engine a listing describes before comparing prices, as these are very different cars.

Generations

• C4 (1994-1997) — First car sold as the S6, based on the first-generation A6, with a turbocharged 2.2-litre five-cylinder petrol engine and later a 4.2-litre V8.
• C5 (1999-2004) — Powered by a 4.2-litre V8 petrol engine with quattro, sold as a saloon and as an Avant.
• C6 (2006-2011) — Introduced a 5.2-litre V10 petrol engine, offered as a saloon and as an Avant.
• C7 (2012-2018) — Used a 4.0-litre twin-turbo V8 petrol engine with a seven-speed dual-clutch gearbox, and was facelifted around 2014.
• C8 (2019-2024) — In Europe the S6 used a mild-hybrid 3.0-litre diesel V6 with an automatic gearbox.
• S6 e-tron (2024-present) — Battery-electric S6 built on the newest A6 generation; our listings show a 100 kWh battery.

Typical prices

Asking prices in our listings broadly rise with newer model years. Cars from 2000 have a median of €6,000, while 2013 cars have a median of €23,500. The 2025 model year has a median of €61,600. Across all model years the median is €38,400. Within one year, price also depends on engine, mileage, condition and country, so compare similar generations and mileages. These are asking prices in our listings on 10 November 2026, not a valuation.

Based on our listings as of 2026-11-10. These are asking prices, not a valuation.

What to check when buying a used Audi S6

Inspect an S6 with its service records in hand, then drive it from cold. A specialist inspection is worth considering for the more complex engines.

• Service history and mileage

  Ask for a full invoiced or stamped history. These engines are high-output, so missed oil changes and delayed major services matter. Compare the stated mileage with the records, especially on cars imported from another country.

• Timing belt service · C5 (4.2 V8)

  The 4.2 V8 uses a timing belt, and replacing it involves a lot of labour. Ask for an invoice showing when it was last done and whether the water pump and tensioners were changed at the same time.

• Complex engine checks · C6 (5.2 V10)

  The V10 is a high-output engine with intricate ancillaries. Scan for stored fault codes, listen for unusual noises on a cold start, and look for oil or coolant leaks. A specialist inspection is sensible before committing.

• Oil use and leaks · C7 (4.0 TFSI V8)

  Owners of twin-turbo V8 engines often discuss oil consumption and seepage around the top of the engine and turbo area. Ask how much oil the car uses, check the level, and look for leaks.

• Dual-clutch gearbox behaviour · C7 (2012-2018)

  Test gearchanges at low and high speed. Hesitation, judder or harsh shifts can point to wear or a missed fluid service. Ask for proof that the gearbox oil was changed on schedule.

• Diesel and mild-hybrid systems · C8 (3.0 TDI mild hybrid)

  Check for dashboard warning lights and ask whether software updates were applied. Short trips can affect diesel particulate filters, so ask how the car was used. Test all driver aids and any air suspension fitted.

• LPG conversion paperwork · LPG-converted cars

  Some listings are LPG conversions. Ask for the installation paperwork and recent inspection records for the tank and system. Check that the car runs smoothly on both petrol and gas, and that the fitter is identifiable.

Frequently asked questions