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: 41,805 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

With 41,805 miles on the clock, this 2018 BMW 4 Series M Sport has done roughly 21,400 fewer miles than a typical 2018 BMW 4 Series. Priced at £15,000, it is advertised £1,403 below the AskCar estimate of £16,403. To work out the AskCar estimate, we analyse UK dealer adverts for 1,787 BMW 4 Series cars across different ages and specifications. We first recorded this advert 69 days ago, and its asking price has since fallen by £2,650. The government's MOT record matches its advertised mileage. You can find this car at Cotswold Group Select in Tewkesbury. 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

Good value: £1,403 (8%) under the AskCar estimate of £16,403.

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 69 days.

Price history

AskCar first saw this advert on 25 August 2026 at £17,650. Its asking price is now £15,000, £2,650 less. The latest price cut was seen on 30 October 2026.

Price changes recorded:

• 25 August 2026: £17,650
• 30 August 2026: £17,000
• 31 August 2026: £16,500
• 8 September 2026: £16,250
• 10 September 2026: £16,000
• 15 September 2026: £15,750
• 18 October 2026: £15,500
• 20 October 2026: £15,250
• 30 October 2026: £15,000

Mileage and MOT

MOT, from the government's MOT records (DVSA, the Driver and Vehicle Standards Agency), as of 2 November 2026: valid until 5 June 2027.

It failed its MOT on 28 May 2026 (offside front windscreen wiper blade defective; nearside front lower suspension arm ball joint excessively worn) and passed 1 day later, on 29 May 2026.

Advisories at the latest test: offside front windscreen wiper blade defective; front brake disc worn, pitted or scored, but not seriously weakened; rear brake disc worn, pitted or scored, but not seriously weakened.

Mileage at that test: 41,568 miles, which matches the advertised 41,805 miles.

Advertised mileage is about 21,400 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 £18,489, as of 2 November 2026.

The 3 closest to this car in mileage:

• 2018 BMW 4 Series M Sport, 2.0 diesel convertible, black. Mileage: 44,939 miles. Price: £15,750, £750 more than this car. Dealer: Beechwood Prestige in Doncaster. AskCar page: https://askcar.co.uk/car/bmw-4-series-2018-39ba4ddf551d
• 2018 BMW 4 Series M Sport, 2.0 diesel convertible, black. Mileage: 35,664 miles. Price: £15,990, £990 more than this car. Dealer: Auto Technik in Lutterworth. AskCar page: https://askcar.co.uk/car/bmw-4-series-2018-89371e9b0436
• 2018 BMW 4 Series M Sport, 2.0 diesel convertible, grey. Mileage: 49,000 miles. Price: £15,996, £996 more than this car. Dealer: Dave Fox Cars in Stone. AskCar page: https://askcar.co.uk/car/bmw-4-series-2018-3f2bb570f9dc

• The nearest: 2018 BMW 4 Series M Sport, 2.0 diesel convertible, blue, 46 miles from this car. Mileage: 24,000 miles. Price: £18,489, £3,489 more than this car. Dealer: AffordableCar in Tamworth. AskCar page: https://askcar.co.uk/car/bmw-4-series-2018-d163e4faae19