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: 44,939 miles
• Fuel: Diesel
• Body: Convertible, 2 doors, 4 seats
• Engine: 2.0 litres, 187 bhp
• Gearbox: Automatic
• Drive: Rear-wheel drive
• Colour: Black
• CO2: 124 g/km
• Emissions standard: Euro 6, ULEZ compliant

About this car

This 2018 BMW 4 Series M Sport has covered 44,939 miles, around 18,100 fewer miles than is typical for its age. The dealer is asking £15,750, which is £316 below the AskCar estimate of £16,066. To work out the AskCar estimate, we analyse UK dealer adverts for 1,814 BMW 4 Series cars across different ages and specifications. It first appeared in our advert records 42 days ago. According to the government's MOT record, its advertised mileage is consistent with the latest test. It is advertised by Beechwood Prestige in Doncaster. How to contact the dealer and its opening hours are on this AskCar page.

Stock data as of 4 November 2026.

How we estimate prices and check cars

Price

Fair price: £316 (1%) under the AskCar estimate of £16,066.

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 1,814 priced BMW 4 Series adverts across different ages and specifications, as of 4 November 2026.

A 2018 BMW 4 Series with the 2.0 diesel engine is typically advertised at £14,500: the median of the 112 for sale on AskCar, as of 4 November 2026.

Time on sale

This 2018 BMW 4 Series has been on sale for at least 42 days.

Price history

AskCar first saw this advert on 23 September 2026 at £15,750. 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 4 November 2026: valid until 8 August 2027.

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

There were no advisories at the latest test.

Mileage at that test: 43,909 miles, which matches the advertised 44,939 miles.

Advertised mileage is about 18,100 miles lower than the median mileage of a 2018 BMW 4 Series on AskCar.

Similar cars

11 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 4 November 2026.

The 3 closest to this car in mileage:

• 2018 BMW 4 Series M Sport, 2.0 diesel convertible, grey. Mileage: 41,805 miles. Price: £14,750, £1,000 less than this car. Dealer: Cotswold Group Select in Tewkesbury. AskCar page: https://askcar.co.uk/car/bmw-4-series-2018-46fddfc27546
• 2018 BMW 4 Series M Sport, 2.0 diesel convertible, grey. Mileage: 49,000 miles. Price: £15,996, £246 more than this car. Dealer: Dave Fox Cars in Stone. AskCar page: https://askcar.co.uk/car/bmw-4-series-2018-3f2bb570f9dc
• 2018 BMW 4 Series M Sport, 2.0 diesel convertible, red. Mileage: 49,648 miles. Price: £16,495, £745 more than this car. Dealer: Motoring WAY in Abertillery. AskCar page: https://askcar.co.uk/car/bmw-4-series-2018-53bb1b8dd3c3

• The nearest: 2018 BMW 4 Series M Sport, 2.0 diesel convertible, 28 miles from this car. Mileage: 31,600 miles. Price: £16,795, £1,045 more than this car. Dealer: Prestige Performance (Yorkshire) in North Duffield. AskCar page: https://askcar.co.uk/car/bmw-4-series-2018-4a86097e9ea3