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: 67,865 miles
• Fuel: Diesel, mild hybrid
• Body: Saloon, 4 doors, 5 seats
• Engine: 3.0 litres, 335 bhp
• Gearbox: Automatic
• Drive: Four-wheel drive
• Colour: Grey
• CO2: 160 g/km
• Emissions standard: Euro 6, ULEZ compliant

About this car

This 2021 BMW 3 Series has covered 67,865 miles, around 12,700 more miles than is typical for its age. The AskCar estimate for this car is £24,989. It is priced at £24,736, which is £253 below that estimate. To work out the AskCar estimate, we analyse UK dealer adverts for 6,902 BMW 3 Series cars across different ages and specifications. We first saw this car advertised 23 days ago. Its asking price has since fallen by £2,254. According to the government's MOT record, its advertised mileage is consistent with the latest test. The seller is Vertu BMW Bridgwater, based in Bridgwater. 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: £253 (1%) under the AskCar estimate of £24,989.

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 23 days.

Price history

AskCar first saw this advert on 14 October 2026 at £26,990. Its asking price is now £24,736, £2,254 less. The latest price cut was seen on 6 November 2026.

Price changes recorded:

• 14 October 2026: £26,990
• 16 October 2026: £25,456
• 17 October 2026: £25,425
• 22 October 2026: £25,242
• 23 October 2026: £25,170
• 31 October 2026: £24,736

Mileage and MOT

MOT, from the government's MOT records (DVSA, the Driver and Vehicle Standards Agency), as of 6 November 2026: valid until 2 June 2027.

It failed its MOT on 21 May 2026 (offside rear shock absorbers has a serious fluid leak) and passed 13 days later, on 3 June 2026.

There were no advisories at the latest test.

Mileage at that test: 60,340 miles, which matches the advertised 67,865 miles.

Advertised mileage is about 12,700 miles higher than the median mileage of a 2021 BMW 3 Series on AskCar.