2021 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: 2021
• Mileage: 9,250 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

With 9,250 miles on the clock, this 2021 BMW 8 Series M Sport has done roughly 33,700 fewer miles than a typical 2021 BMW 8 Series. The dealer is asking £40,514, which is £2,439 above the AskCar estimate of £38,075. To work out the AskCar estimate, we analyse UK dealer adverts for 185 BMW 8 Series cars across different ages and specifications. The asking price is now £1,967 lower than when we first recorded the advert 40 days ago. Our latest MOT record expired on 12 August 2026. Check the current position with the dealer. The government's MOT record matches its advertised mileage. You can find this car at Vertu BMW Teesside in Stockton-on-Tees. How to contact the dealer and its opening hours are on this AskCar page.

Stock data as of 9 November 2026.

How we estimate prices and check cars

Price

Fair price: £2,439 (6%) over the AskCar estimate of £38,075.

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 9 November 2026.

A 2021 BMW 8 Series with the 3.0 petrol engine is typically advertised at £32,500: the median of the 24 for sale on AskCar, as of 9 November 2026.

Time on sale

This 2021 BMW 8 Series has been on sale for at least 40 days.

Price history

AskCar first saw this advert on 30 September 2026 at £42,481. Its asking price is now £40,514, £1,967 less. The latest price cut was seen on 7 November 2026.

Price changes recorded:

• 30 September 2026: £42,481
• 1 October 2026: £42,271
• 6 October 2026: £42,406
• 8 October 2026: £42,250
• 9 October 2026: £42,039
• 10 October 2026: £41,967
• 11 October 2026: £41,945
• 13 October 2026: £41,885
• 14 October 2026: £41,861
• 15 October 2026: £41,685
• 16 October 2026: £41,549
• 17 October 2026: £41,512
• 20 October 2026: £41,218
• 21 October 2026: £41,014
• 7 November 2026: £40,514

Mileage and MOT

MOT, from the government's MOT records (DVSA, the Driver and Vehicle Standards Agency), as of 9 November 2026: the latest record we hold ran out on 12 August 2026; ask the dealer for the current MOT.

It has had 3 MOTs. The latest, on 13 August 2025, passed.

There were no advisories at the latest test.

Mileage at that test: 4,552 miles, which matches the advertised 9,250 miles.

Advertised mileage is about 33,700 miles lower than the median mileage of a 2021 BMW 8 Series on AskCar.

Similar cars

3 other 2021 BMW 8 Series M Sport 3.0 petrol automatic convertibles are for sale at UK dealers, from £31,990 to £33,975, as of 9 November 2026.

The 3 closest to this car in mileage:

• 2021 BMW 8 Series M Sport, 3.0 petrol convertible, black. Mileage: 32,433 miles. Price: £33,975, £6,539 less than this car. Dealer: PCBS Sales in Tonbridge. AskCar page: https://askcar.co.uk/car/bmw-8-series-2021-e587dbeecdb3
• 2021 BMW 8 Series M Sport, 3.0 petrol convertible, grey. Mileage: 42,000 miles. Price: £33,495, £7,019 less than this car. Dealer: Auto 2000 in Havering. AskCar page: https://askcar.co.uk/car/bmw-8-series-2021-a1c318686c60
• 2021 BMW 8 Series M Sport, 3.0 petrol convertible, black. Mileage: 50,000 miles. Price: £31,990, £8,524 less than this car. Dealer: LTV in Manchester. AskCar page: https://askcar.co.uk/car/bmw-8-series-2021-2d45d3fa23e5