2021 BMW 3 Series 3.0 M340i MHT

Overview

• Make: BMW
• Model: 3 Series
• Version: 3.0 M340i MHT Auto 4WD Euro 6 (s/s) 4dr (369 bhp)
• Year: 2021
• Mileage: 56,411 miles
• Fuel: Petrol, mild hybrid
• Body: Saloon, 4 doors, 5 seats
• Engine: 3.0 litres, 369 bhp
• Gearbox: Automatic
• Drive: Four-wheel drive
• Colour: Black
• CO2: 176 g/km
• Emissions standard: Euro 6, ULEZ compliant

About this car

The advertised mileage for this 2021 BMW 3 Series is 56,411 miles. Priced at £29,400, it is advertised £364 below the AskCar estimate of £29,764. The AskCar estimate draws on 6,902 BMW 3 Series adverts across the UK, adjusting for age, mileage, trim, engine and other specifications. We first saw this car advertised 35 days ago. Its asking price has since fallen by £595. We checked its advertised mileage against the government's MOT record, and they match. The seller is Grainger Motor Group Mantles BYD Royston, based in Royston. 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: £364 (1%) under the AskCar estimate of £29,764.

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 petrol 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 35 days.

Price history

AskCar first saw this advert on 2 October 2026 at £29,995. Its asking price is now £29,400, £595 less. The latest price cut was seen on 3 November 2026.

Price changes recorded:

• 2 October 2026: £29,995
• 3 November 2026: £29,400

Mileage and MOT

MOT, from the government's MOT records (DVSA, the Driver and Vehicle Standards Agency), as of 6 November 2026: valid until 28 June 2027.

It has had 3 MOTs. The latest, on 29 June 2026, passed.

There were no advisories at the latest test.

Mileage at that test: 55,098 miles, which matches the advertised 56,411 miles.

Advertised mileage is about 1,300 miles higher than the median mileage of a 2021 BMW 3 Series on AskCar.