2021 BMW M3 3.0 BiTurbo Competition

Overview

• Make: BMW
• Model: M3
• Trim: Competition
• Version: 3.0 BiTurbo Competition Steptronic RWD Euro 6 (s/s) 4dr (503 bhp)
• Year: 2021
• Mileage: 18,500 miles
• Fuel: Petrol
• Body: Saloon, 4 doors, 5 seats
• Engine: 3.0 litres, 503 bhp
• Gearbox: Automatic (Steptronic)
• Drive: Rear-wheel drive
• Colour: White
• Emissions standard: Euro 6, ULEZ compliant

About this car

This 2021 BMW M3 Competition has covered 18,500 miles, around 8,400 fewer miles than is typical for its age. The AskCar estimate for this car is £56,574. It is priced at £48,950, which is £7,624 below that estimate. The AskCar estimate uses 756 UK dealer adverts for the BMW M3, with adjustments for age, mileage, trim, engine and other specifications. We have tracked this advert for 158 days. The recorded MOT expired on 12 June 2026, so ask the dealer whether it has been renewed. We checked its advertised mileage against the government's MOT record, and they match. The seller is Westside Cars, based in Wednesbury. How to contact the dealer and its opening hours are on this AskCar page.

Stock data as of 2 November 2026.

How we estimate prices and check cars

Price

Good value: £7,624 (13%) under the AskCar estimate of £56,574.

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 756 priced BMW M3 adverts across different ages and specifications, as of 2 November 2026.

A 2021 BMW M3 with the 3.0 petrol engine is typically advertised at £53,500: the median of the 42 for sale on AskCar, as of 2 November 2026.

Time on sale

This 2021 BMW M3 has been on sale for at least 158 days.

Price history

AskCar first saw this advert on 28 May 2026 at £48,950. 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 2 November 2026: the latest record we hold ran out on 12 June 2026; ask the dealer for the current MOT.

It has had one MOT, on 13 June 2025, and passed.

There were no advisories at the latest test.

Mileage at that test: 18,054 miles, which matches the advertised 18,500 miles.

Advertised mileage is about 8,400 miles lower than the median mileage of a 2021 BMW M3 on AskCar.

Similar cars

37 other 2021 BMW M3 Competition 3.0 petrol automatic saloons are for sale at UK dealers, from £42,989 to £78,999, as of 2 November 2026.

The 3 closest to this car in mileage:

• 2021 BMW M3 Competition, 3.0 petrol saloon, grey. Mileage: 17,981 miles. Price: £58,300, £9,350 more than this car. Dealer: John Clark BMW Aberdeen in Aberdeen. AskCar page: https://askcar.co.uk/car/bmw-m3-2021-b96af864bcef
• 2021 BMW M3 Competition, 3.0 petrol saloon, grey. Mileage: 20,000 miles. Price: £49,995, £1,045 more than this car. Dealer: S & S Car Sales in Glenrothes. AskCar page: https://askcar.co.uk/car/bmw-m3-2021-296925a4e0d9
• 2021 BMW M3 Competition, 3.0 petrol saloon, black. Mileage: 16,000 miles. Price: £56,995, £8,045 more than this car. Dealer: Waterways Prestige in Leighton Buzzard. AskCar page: https://askcar.co.uk/car/bmw-m3-2021-a730496dd9e8

• The nearest: 2021 BMW M3 Competition, 3.0 petrol saloon, grey, 8 miles from this car. Mileage: 22,000 miles. Price: £44,995, £3,955 less than this car. Dealer: Hiline Motors in Birmingham. AskCar page: https://askcar.co.uk/car/bmw-m3-2021-f55b34d3700e