2021 BMW 3 Series 3.0 M340d MHT

Overview

• Make: BMW
• Model: 3 Series
• Version: 3.0 M340d MHT Auto 4WD Euro 6 (s/s) 4dr (335 bhp)
• Year: 2021
• Mileage: 66,457 miles
• Fuel: Diesel, mild hybrid
• Body: Saloon, 4 doors, 5 seats
• Engine: 3.0 litres, 335 bhp
• Gearbox: Automatic
• Drive: Four-wheel drive
• Colour: Blue
• CO2: 160 g/km
• Emissions standard: Euro 6, ULEZ compliant

About this car

With 66,457 miles on the clock, this 2021 BMW 3 Series has done roughly 11,300 more miles than a typical 2021 BMW 3 Series. The dealer is asking £19,995, which is £5,266 below the AskCar estimate of £25,261. To work out the AskCar estimate, we analyse UK dealer adverts for 6,902 BMW 3 Series cars across different ages and specifications. The asking price is now £2,000 lower than when we first recorded the advert 121 days ago. Our latest MOT record expired on 8 September 2026. Check the current position with the dealer. Its advertised mileage matches the government's MOT record. The seller is Top Gear Harrow, based in Harrow. 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

Good value: £5,266 (20%) under the AskCar estimate of £25,261.

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 6,902 priced BMW 3 Series adverts across different ages and specifications, as of 6 November 2026.

A 2021 BMW 3 Series with the 3.0 diesel engine is typically advertised at £28,500: the median of the 146 for sale on AskCar, as of 6 November 2026.

Time on sale

This 2021 BMW 3 Series has been on sale for at least 121 days.

Price history

AskCar first saw this advert on 8 July 2026 at £21,995. Its asking price is now £19,995, £2,000 less. The latest price cut was seen on 28 September 2026.

Price changes recorded:

• 9 July 2026: £21,995
• 2 August 2026: £21,495
• 26 August 2026: £20,995
• 28 September 2026: £19,995

Mileage and MOT

MOT, from the government's MOT records (DVSA, the Driver and Vehicle Standards Agency), as of 6 November 2026: the latest record we hold ran out on 8 September 2026; ask the dealer for the current MOT.

It has had 2 MOTs. The latest, on 5 September 2025, passed.

There were no advisories at the latest test.

Mileage at that test: 48,599 miles, which matches the advertised 66,457 miles.

Advertised mileage is about 11,300 miles higher than the median mileage of a 2021 BMW 3 Series on AskCar.