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: 32,433 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 32,433 miles, this 2021 BMW 8 Series M Sport has covered about 11,300 fewer miles than other 2021 BMW 8 Series cars. Priced at £33,975, it is advertised £290 below the AskCar estimate of £34,265. The AskCar estimate draws on 186 BMW 8 Series adverts across the UK, adjusting for age, mileage, trim, engine and other specifications. Since we first spotted the advert 84 days ago, the asking price has dropped by £2,000. According to the government's MOT record, its advertised mileage is consistent with the latest test. It is for sale at PCBS Sales in Tonbridge. 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

Fair price: £290 (under 1%) under the AskCar estimate of £34,265.

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 186 priced BMW 8 Series adverts across different ages and specifications, as of 5 November 2026.

A 2021 BMW 8 Series with the 3.0 petrol engine is typically advertised at £32,500: the median of the 23 for sale on AskCar, as of 5 November 2026.

Time on sale

This 2021 BMW 8 Series has been on sale for at least 84 days.

Price history

AskCar first saw this advert on 13 August 2026 at £35,975. Its asking price is now £33,975, £2,000 less. The latest price cut was seen on 17 September 2026.

Price changes recorded:

• 13 August 2026: £35,975
• 15 September 2026: £34,975
• 17 September 2026: £33,975

Mileage and MOT

MOT, from the government's MOT records (DVSA, the Driver and Vehicle Standards Agency), as of 5 November 2026: valid until 10 June 2027.

It failed its MOT on 14 May 2026 (nearside front tyre has ply or cords exposed inner edge) and passed later the same day.

There were no advisories at the latest test.

Mileage at that test: 31,004 miles, which matches the advertised 32,433 miles.

Advertised mileage is about 11,300 miles lower than the median mileage of a 2021 BMW 8 Series on AskCar.

Similar cars

2 other 2021 BMW 8 Series M Sport 3.0 petrol automatic convertibles are for sale at UK dealers, from £33,495 to £41,014, as of 5 November 2026.

The 2 closest to this car in mileage:

• 2021 BMW 8 Series M Sport, 3.0 petrol convertible, grey. Mileage: 42,000 miles. Price: £33,495, £480 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: 9,250 miles. Price: £41,014, £7,039 more than this car. Dealer: Vertu BMW Teesside in Teesside. AskCar page: https://askcar.co.uk/car/bmw-8-series-2021-afb8e27345aa