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: 24,000 miles
• Fuel: Diesel
• Body: Convertible, 2 doors, 4 seats
• Engine: 2.0 litres, 187 bhp
• Gearbox: Automatic
• Drive: Rear-wheel drive
• Colour: Blue
• CO2: 124 g/km
• Emissions standard: Euro 6, ULEZ compliant

About this car

This 2018 BMW 4 Series M Sport is advertised with 24,000 miles on the clock. Priced at £18,489, it is advertised £514 above the AskCar estimate of £17,975. The AskCar estimate uses UK dealer asking prices, including 1,787 BMW 4 Series adverts, and accounts for the car’s age, mileage and specification. We have tracked this advert for 103 days. Ask the dealer why the advert shows fewer miles than the 24,567 recorded at the latest MOT. MOT records show an expiry date of 30 May 2027. The seller is AffordableCar, based in Tamworth. How to contact the dealer and its opening hours are on this AskCar page.

Stock data as of 2 November 2026.

How we estimate prices and check cars

Price

Fair price: £514 (2%) over the AskCar estimate of £17,975.

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 1,787 priced BMW 4 Series adverts across different ages and specifications, as of 2 November 2026.

A 2018 BMW 4 Series with the 2.0 diesel engine is typically advertised at £14,800: the median of the 112 for sale on AskCar, as of 2 November 2026.

Time on sale

This 2018 BMW 4 Series has been on sale for at least 103 days.

Price history

AskCar first saw this advert on 22 July 2026 at £18,489. 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 2 November 2026: valid until 30 May 2027.

It has had 6 MOTs. The latest, on 22 May 2026, passed.

There were no advisories at the latest test.

Mileage at that test: 24,567 miles. The advert says 24,000 miles, fewer than the MOT record, so ask the dealer which is right.

Advertised mileage is about 39,300 miles lower than the median mileage of a 2018 BMW 4 Series on AskCar.

Similar cars

12 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 2 November 2026.

The 3 closest to this car in mileage:

• 2018 BMW 4 Series M Sport, 2.0 diesel convertible, grey. Mileage: 28,570 miles. Price: £17,995, £494 less than this car. Dealer: The Plough Garage in Farnham. AskCar page: https://askcar.co.uk/car/bmw-4-series-2018-6ce2940f3e23
• 2018 BMW 4 Series M Sport, 2.0 diesel convertible, white. Mileage: 29,068 miles. Price: £16,997, £1,492 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. Mileage: 31,600 miles. Price: £16,795, £1,694 less than this car. Dealer: Prestige Performance (Yorkshire) in North Duffield. AskCar page: https://askcar.co.uk/car/bmw-4-series-2018-4a86097e9ea3

• The nearest: 2018 BMW 4 Series M Sport, 2.0 diesel convertible, black, 23 miles from this car. Mileage: 35,664 miles. Price: £15,990, £2,499 less than this car. Dealer: Auto Technik in Lutterworth. AskCar page: https://askcar.co.uk/car/bmw-4-series-2018-89371e9b0436