2018 BMW 4 Series 2.0 420d M Sport

Overview

• Make: BMW
• Model: 4 Series
• Trim: M Sport
• Version: 2.0 420d M Sport Auto RWD Euro 6 (s/s) 2dr (187 bhp)
• Year: 2018
• Mileage: 31,352 miles
• Fuel: Diesel
• Body: Convertible, 2 doors, 4 seats
• Engine: 2.0 litres, 187 bhp
• Gearbox: Automatic
• Drive: Rear-wheel drive
• Colour: Grey
• CO2: 124 g/km
• Emissions standard: Euro 6, ULEZ compliant

About this car

This 2018 BMW 4 Series M Sport is advertised with 31,352 miles, approximately 31,800 below the typical mileage for its age. Priced at £17,200, it is advertised £117 below the AskCar estimate of £17,317. The AskCar estimate uses 1,821 UK dealer adverts for the BMW 4 Series, with adjustments for age, mileage, trim, engine and other specifications. This car was first seen in our listings data today. The government's MOT record matches its advertised mileage. You can find this car at Car Planet Barnet in New Southgate. How to contact the dealer and its opening hours are on this AskCar page.

Stock data as of 11 November 2026.

How we estimate prices and check cars

Price

Fair price: £117 (under 1%) under the AskCar estimate of £17,317.

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 1,821 priced BMW 4 Series adverts across different ages and specifications, as of 11 November 2026.

A 2018 BMW 4 Series with the 2.0 diesel engine is typically advertised at £14,500: the median of the 124 for sale on AskCar, as of 11 November 2026.

Time on sale

AskCar first saw this 2018 BMW 4 Series advertised today. About 4 in 10 of 2018 BMW 4 Series cars are gone from sale within a month of being advertised: 137 of the 307 first advertised between 11 July 2026 and 8 October 2026.

Price history

AskCar first saw this advert on 11 November 2026 at £17,200. 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 11 November 2026: valid until 2 April 2027.

It has had 7 MOTs. The latest, on 2 April 2026, passed.

There were no advisories at the latest test.

Mileage at that test: 30,139 miles, which matches the advertised 31,352 miles.

Advertised mileage is about 31,800 miles lower than the median mileage of a 2018 BMW 4 Series on AskCar.

Similar cars

14 other 2018 BMW 4 Series M Sport 2.0 diesel automatic convertibles are for sale at UK dealers, from £13,490 to £17,995, as of 11 November 2026.

The 3 closest to this car in mileage:

• 2018 BMW 4 Series M Sport, 2.0 diesel convertible. Mileage: 31,600 miles. Price: £16,795, £405 less than this car. Dealer: Prestige Performance (Yorkshire) in North Duffield. AskCar page: https://askcar.co.uk/car/bmw-4-series-2018-4a86097e9ea3
• 2018 BMW 4 Series M Sport, 2.0 diesel convertible, white. Mileage: 29,068 miles. Price: £16,995, £205 less than this car. Dealer: Lookers Car Hub South Shields in South Shields. AskCar page: https://askcar.co.uk/car/bmw-4-series-2018-0858ccb93e95
• 2018 BMW 4 Series M Sport, 2.0 diesel convertible, blue. Mileage: 33,822 miles. Price: £17,495, £295 more than this car. Dealer: Sycamore Stamford in Stamford. AskCar page: https://askcar.co.uk/car/bmw-4-series-2018-6c3044b519ae

• The nearest: 2018 BMW 4 Series M Sport, 2.0 diesel convertible, grey, 41 miles from this car. Mileage: 28,699 miles. Price: £17,995, £795 more than this car. Dealer: The Plough Garage in Farnham. AskCar page: https://askcar.co.uk/car/bmw-4-series-2018-6ce2940f3e23