2020 BMW 8 Series 3.0 840i M Sport

Overview

• Make: BMW
• Model: 8 Series
• Trim: M Sport
• Version: 3.0 840i M Sport Steptronic RWD Euro 6 (s/s) 2dr (328 bhp)
• Year: 2020
• Mileage: 22,377 miles
• Fuel: Petrol
• Body: Convertible, 2 doors, 4 seats
• Engine: 3.0 litres, 328 bhp
• Gearbox: Automatic (Steptronic)
• Drive: Rear-wheel drive
• Colour: Black
• CO2: 194 g/km
• Emissions standard: Euro 6, ULEZ compliant

About this car

At 22,377 miles, this 2020 BMW 8 Series M Sport has covered about 18,100 fewer miles than other 2020 BMW 8 Series cars. Priced at £35,994, it is advertised £1,585 above the AskCar estimate of £34,409. The AskCar estimate uses UK dealer asking prices, including 185 BMW 8 Series adverts, and accounts for the car’s age, mileage and specification. Since we first spotted the advert 62 days ago, the asking price has dropped by £1,856. We checked its advertised mileage against the government's MOT record, and they match. The seller is Group 1 Reading BMW, based in Reading. How to contact the dealer and its opening hours are on this AskCar page.

Stock data as of 6 November 2026.

How we estimate prices and check cars

Price

Fair price: £1,585 (4%) over the AskCar estimate of £34,409.

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 185 priced BMW 8 Series adverts across different ages and specifications, as of 6 November 2026.

A 2020 BMW 8 Series with the 3.0 petrol engine is typically advertised at £29,200: the median of the 37 for sale on AskCar, as of 6 November 2026.

Time on sale

This 2020 BMW 8 Series has been on sale for at least 62 days.

Price history

AskCar first saw this advert on 5 September 2026 at £37,850. Its asking price is now £35,994, £1,856 less. The latest price cut was seen on 1 November 2026.

Price changes recorded:

• 5 September 2026: £37,850
• 12 September 2026: £37,994
• 22 September 2026: £37,650
• 1 October 2026: £37,489
• 3 October 2026: £36,994
• 8 October 2026: £36,745
• 14 October 2026: £36,450
• 15 October 2026: £36,994
• 21 October 2026: £36,745
• 24 October 2026: £36,994
• 30 October 2026: £36,494
• 1 November 2026: £35,994

Mileage and MOT

MOT, from the government's MOT records (DVSA, the Driver and Vehicle Standards Agency), as of 6 November 2026: valid until 12 March 2027.

It has had 3 MOTs. The latest, on 13 March 2026, passed.

There were no advisories at the latest test.

Mileage at that test: 20,006 miles, which matches the advertised 22,377 miles.

Advertised mileage is about 18,100 miles lower than the median mileage of a 2020 BMW 8 Series on AskCar.

Similar cars

3 other 2020 BMW 8 Series M Sport 3.0 petrol automatic convertibles are for sale at UK dealers, from £30,995 to £34,450, as of 6 November 2026.

The 3 closest to this car in mileage:

• 2020 BMW 8 Series M Sport, 3.0 petrol convertible, black. Mileage: 33,395 miles. Price: £34,450, £1,544 less than this car. Dealer: MINI UK at Group 1 Lincoln in Lincoln. AskCar page: https://askcar.co.uk/car/bmw-8-series-2020-4d48d8426cca
• 2020 BMW 8 Series M Sport, 3.0 petrol convertible, white. Mileage: 51,903 miles. Price: £31,499, £4,495 less than this car. Dealer: Lookers BMW Stafford in Stafford. AskCar page: https://askcar.co.uk/car/bmw-8-series-2020-63512853c8cb
• 2020 BMW 8 Series M Sport, 3.0 petrol convertible, black. Mileage: 56,298 miles. Price: £30,995, £4,999 less than this car. Dealer: Berry Croydon BMW in Croydon. AskCar page: https://askcar.co.uk/car/bmw-8-series-2020-4044e75a4a6f