2018 Audi A6 Avant 2.0 TDI S Line

Overview

• Make: Audi
• Model: A6 Avant
• Trim: S Line
• Version: 2.0 TDI 40 S Line S tronic FWD Euro 6 (s/s) 5dr (201 bhp)
• Year: 2018
• Mileage: 46,000 miles
• Fuel: Diesel
• Body: Estate, 5 doors, 5 seats
• Engine: 2.0 litres, 201 bhp
• Gearbox: Automatic (S tronic)
• Drive: Front-wheel drive
• Colour: Grey
• CO2: 124 g/km
• Emissions standard: Euro 6, ULEZ compliant

About this car

This 2018 Audi A6 Avant S Line has covered 46,000 miles, around 37,700 fewer miles than is typical for its age. Priced at £20,299, it is advertised £937 below the AskCar estimate of £21,236. To work out the AskCar estimate, we analyse UK dealer adverts for 789 Audi A6 Avant cars across different ages and specifications. We have tracked this advert for 31 days. Its advertised mileage matches the government's MOT record. You can find this car at AB Car Sales in Gunnislake. How to contact the dealer and its opening hours are on this AskCar page.

Stock data as of 7 November 2026.

How we estimate prices and check cars

Price

Fair price: £937 (4%) under the AskCar estimate of £21,236.

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 789 priced Audi A6 Avant adverts across different ages and specifications, as of 7 November 2026.

A 2018 Audi A6 Avant with the 2.0 diesel engine is typically advertised at £14,500: the median of the 50 for sale on AskCar, as of 7 November 2026.

Time on sale

This 2018 Audi A6 Avant has been on sale for at least 31 days.

Price history

AskCar first saw this advert on 7 October 2026 at £20,299. 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 7 November 2026: valid until 20 November 2026.

It has had 7 MOTs. The latest, on 18 November 2025, passed.

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

Mileage at that test: 42,240 miles, which matches the advertised 46,000 miles.

Advertised mileage is about 37,700 miles lower than the median mileage of a 2018 Audi A6 Avant on AskCar.

Similar cars

15 other 2018 Audi A6 Avant S Line 2.0 diesel automatic estates are for sale at UK dealers, from £9,950 to £18,250, as of 7 November 2026.

The 3 closest to this car in mileage:

• 2018 Audi A6 Avant S Line, 2.0 diesel estate, blue. Mileage: 56,707 miles. Price: £18,250, £2,049 less than this car. Dealer: Car Planet Barnet in Barnet. AskCar page: https://askcar.co.uk/car/audi-a6-avant-2018-34fb5f039233
• 2018 Audi A6 Avant S Line, 2.0 diesel estate, grey. Mileage: 57,241 miles. Price: £17,999, £2,300 less than this car. Dealer: GH Car Sales in Morpeth. AskCar page: https://askcar.co.uk/car/audi-a6-avant-2018-00aad5f77efa
• 2018 Audi A6 Avant S Line, 2.0 diesel estate, black. Mileage: 57,753 miles. Price: £16,299, £4,000 less than this car. Dealer: Pinetree Car Superstore - Tonypandy in Tonypandy. AskCar page: https://askcar.co.uk/car/audi-a6-avant-2018-53f1531a325c

• The nearest: 2018 Audi A6 Avant S Line, 2.0 diesel estate, blue, 80 miles from this car. Mileage: 67,000 miles. Price: £14,990, £5,309 less than this car. Dealer: Six Ways Car Sales in Swansea. AskCar page: https://askcar.co.uk/car/audi-a6-avant-2018-1fe7a9610350