About the Audi S6
The Audi S6 sits between the standard A6 and the flagship RS6, offering serious performance without the extreme price tag. The C5 generation (1999-2004) featured a 4.2-litre V8, whilst the C6 (2006-2011) arrived with a 5.2-litre V10 producing 435bhp. The C7 (2012-2018) switched to a supercharged 4.0-litre V8 with 420bhp, and the current C8 (2019-present) uses a mild-hybrid 2.9-litre twin-turbo V6 with 444bhp. All generations come with quattro all-wheel drive and are available as both saloon and Avant estate variants. Standard equipment includes leather upholstery, advanced infotainment systems, and comprehensive driver assistance features on newer models.
What Affects the Price
Generation is the primary price factor, with C8 models commanding £35,000-£45,000, C7 examples ranging from £15,000-£35,000, and C6 models from £8,000-£18,000. Mileage significantly impacts value—sub-50,000-mile examples attract premiums of 20-30% over higher-mileage alternatives. The Avant estate typically commands £1,000-£2,000 more than saloon equivalents due to greater practicality and desirability. Full Audi service history is essential and can add 10-15% to value, whilst missing service stamps raise questions about expensive maintenance items. Specification matters considerably, with the Black Edition, Carbon Black, and Vorsprung trims commanding higher prices. Optional extras like Matrix LED headlights, adaptive air suspension, and the Bang & Olufsen sound system improve resale values. Condition of wear items including brakes, tyres, and suspension components affects negotiating position, as replacement costs are substantial.
Buying Tips
Insist on comprehensive service history, particularly evidence of oil changes every 9,000 miles or annually—critical for longevity of high-performance engines. On C6 V10 models, check for carbon build-up issues and ensure the timing chain has been inspected or replaced if approaching 80,000 miles. C7 supercharged V8s should have smooth power delivery without whining from the supercharger, and check for oil leaks from cam chain tensioners. For C8 models, ensure all software updates have been applied and mild-hybrid system functions correctly. Inspect for rust on front subframes and suspension mounting points, especially on pre-2015 cars. Test the quattro system on varied surfaces and check for juddering or binding. Verify that air suspension (if fitted) raises and lowers correctly without warning lights. Budget £1,500-£2,500 annually for servicing and tyres, plus £500-£800 for insurance group 46-50 cover. Check MOT history for patterns of failure on brake and suspension components. Consider extended warranty coverage for C7 and C8 models given complexity of electronics and potential repair costs exceeding £2,000 for major faults.