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: 79,227 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

At 79,227 miles, this 2021 BMW 3 Series has covered about 24,400 more miles than other 2021 BMW 3 Series cars. Priced at £22,050, it is advertised £761 below the AskCar estimate of £22,811. The AskCar estimate draws on 6,822 BMW 3 Series adverts across the UK, adjusting for age, mileage, trim, engine and other specifications. We first saw this car advertised 30 days ago. Its asking price has since fallen by £900. According to the government's MOT record, its advertised mileage is consistent with the latest test. It is for sale at Car Planet Watford in Rickmansworth. How to contact the dealer and its opening hours are on this AskCar page.

Stock data as of 8 November 2026.

How we estimate prices and check cars

Price

Fair price: £761 (3%) under the AskCar estimate of £22,811.

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 6,822 priced BMW 3 Series adverts across different ages and specifications, as of 8 November 2026.

A 2021 BMW 3 Series with the 3.0 diesel engine is typically advertised at £28,400: the median of the 146 for sale on AskCar, as of 8 November 2026.

Time on sale

This 2021 BMW 3 Series has been on sale for at least 30 days.

Price history

AskCar first saw this advert on 9 October 2026 at £22,950. Its asking price is now £22,050, £900 less. The latest price cut was seen on 7 November 2026.

Price changes recorded:

• 9 October 2026: £22,950
• 26 October 2026: £22,650
• 1 November 2026: £22,350
• 7 November 2026: £22,050

Mileage and MOT

MOT, from the government's MOT records (DVSA, the Driver and Vehicle Standards Agency), as of 8 November 2026: valid until 23 July 2027.

It has had 5 MOTs. The latest, on 17 July 2026, passed.

There were no advisories at the latest test.

Mileage at that test: 76,111 miles, which matches the advertised 79,227 miles.

Advertised mileage is about 24,400 miles higher than the median mileage of a 2021 BMW 3 Series on AskCar.