2018 Audi A6 Avant 3.0 TDI V6 S Line

Overview

• Make: Audi
• Model: A6 Avant
• Trim: S Line
• Version: 3.0 TDI V6 50 S Line Tiptronic 4WD Euro 6 (s/s) 5dr (282 bhp)
• Year: 2018
• Mileage: 58,050 miles
• Fuel: Diesel
• Body: Estate, 5 doors, 5 seats
• Engine: 3.0 litres, 282 bhp
• Gearbox: Automatic (Tiptronic)
• Drive: Four-wheel drive
• Colour: Blue
• CO2: 151 g/km
• Emissions standard: Euro 6, ULEZ compliant

About this car

This 2018 Audi A6 Avant S Line is advertised with 58,050 miles, approximately 25,300 below the typical mileage for its age. Its asking price of £20,700 is £2,027 below the AskCar estimate of £22,727. The AskCar estimate draws on 785 Audi A6 Avant adverts across the UK, adjusting for age, mileage, trim, engine and other specifications. We have tracked this advert today. Its advertised mileage matches the government's MOT record. The seller is Car Planet Watford, based in Rickmansworth. How to contact the dealer and its opening hours are on this AskCar page.

Stock data as of 5 November 2026.

How we estimate prices and check cars

Price

Good value: £2,027 (8%) under the AskCar estimate of £22,727.

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 785 priced Audi A6 Avant adverts across different ages and specifications, as of 5 November 2026.

A 2018 Audi A6 Avant with the 3.0 diesel engine is typically advertised at £18,600: the median of the 11 for sale on AskCar, as of 5 November 2026.

Time on sale

AskCar first saw this 2018 Audi A6 Avant advertised today. About half of 2018 Audi A6 Avant cars are gone from sale within a month of being advertised: 33 of the 64 first advertised between 13 July 2026 and 2 October 2026.

Price history

AskCar first saw this advert on 5 November 2026 at £20,700. Its asking price has not changed.

Mileage and MOT

MOT, from the government's MOT records (DVSA, the Driver and Vehicle Standards Agency), as of 5 November 2026: valid until 9 August 2027.

It has had 6 MOTs. The latest, on 28 July 2026, passed.

There were no advisories at the latest test.

Mileage at that test: 55,196 miles, which matches the advertised 58,050 miles.

Advertised mileage is about 25,300 miles lower than the median mileage of a 2018 Audi A6 Avant on AskCar.

Similar cars

5 other 2018 Audi A6 Avant S Line 3.0 diesel automatic estates are for sale at UK dealers, from £13,625 to £23,490, as of 5 November 2026.

The 3 closest to this car in mileage:

• 2018 Audi A6 Avant S Line, 3.0 diesel estate, grey. Mileage: 62,000 miles. Price: £23,490, £2,790 more than this car. Dealer: Cheshire Performance in Audenshaw. AskCar page: https://askcar.co.uk/car/audi-a6-avant-2018-26ee58b2e456
• 2018 Audi A6 Avant S Line, 3.0 diesel estate, black. Mileage: 87,865 miles. Price: £16,995, £3,705 less than this car. Dealer: Sherwood Car Centre in Nottingham. AskCar page: https://askcar.co.uk/car/audi-a6-avant-2018-ed774443d6af
• 2018 Audi A6 Avant S Line, 3.0 diesel estate, black. Mileage: 96,000 miles. Price: £18,890, £1,810 less than this car. Dealer: BM Vehicles in Ware. AskCar page: https://askcar.co.uk/car/audi-a6-avant-2018-2b14c053512d

• The nearest: 2018 Audi A6 Avant S Line, 3.0 diesel estate, blue, 3 miles from this car. Mileage: 159,000 miles. Price: £13,625, £7,075 less than this car. Dealer: German Technik in Rickmansworth. AskCar page: https://askcar.co.uk/car/audi-a6-avant-2018-37f217c16e52