2021 Audi A6 Saloon 3.0 TDI S Line

Overview

• Make: Audi
• Model: A6 Saloon
• Trim: S Line
• Version: 3.0 TDI S Line Tiptronic 4WD Euro 6 4dr 50 (281 bhp)
• Year: 2021
• Mileage: 77,121 miles
• Fuel: Diesel
• Body: Saloon, 4 doors, 5 seats
• Engine: 3.0 litres, 281 bhp
• Gearbox: Automatic (Tiptronic)
• Drive: Four-wheel drive
• Colour: Red
• CO2: 179 g/km
• Emissions standard: Euro 6, ULEZ compliant

About this car

With 77,121 miles on the clock, this 2021 Audi A6 Saloon S Line has done roughly 20,100 more miles than a typical 2021 Audi A6 Saloon. The AskCar estimate for this car is £21,255. It is priced at £18,400, which is £2,855 below that estimate. The AskCar estimate draws on 858 Audi A6 Saloon adverts across the UK, adjusting for age, mileage, trim, engine and other specifications. We first saw this car advertised 55 days ago. Its asking price has since fallen by £1,590. Our latest MOT record expired on 22 October 2026. Check the current position with the dealer. We checked its advertised mileage against the government's MOT record, and they match. The seller is Riverside Car Sales, based in Middlesbrough. How to contact the dealer and its opening hours are on this AskCar page.

Stock data as of 2 November 2026.

How we estimate prices and check cars

Price

Good value: £2,855 (13%) under the AskCar estimate of £21,255.

The AskCar estimate is our expected asking price for this car. It uses UK dealer asking prices, accounting for make, model, trim, version, age, mileage, fuel, gearbox, body type, driven wheels, engine size and power. It is an advertised price, not a confirmed sale price.

It draws on 858 priced Audi A6 Saloon adverts across different ages and specifications, as of 2 November 2026.

Time on sale

This 2021 Audi A6 Saloon has been on sale for at least 55 days.

Price history

AskCar first saw this advert on 8 September 2026 at £19,990. Its asking price is now £18,400, £1,590 less. The latest price cut was seen on 29 October 2026.

Price changes recorded:

• 8 September 2026: £19,990
• 30 September 2026: £19,250
• 16 October 2026: £18,990
• 29 October 2026: £18,400

Mileage and MOT

MOT, from the government's MOT records (DVSA, the Driver and Vehicle Standards Agency), as of 2 November 2026: the latest record we hold ran out on 22 October 2026; ask the dealer for the current MOT.

It has had 2 MOTs. The latest, on 23 October 2025, passed.

Advisories at the latest test: nearside rear tyre worn close to legal limit/worn on edge; offside rear tyre worn close to legal limit/worn on edge.

Mileage at that test: 68,329 miles, which matches the advertised 77,121 miles.

Advertised mileage is about 20,100 miles higher than the median mileage of a 2021 Audi A6 Saloon on AskCar.