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: 49,648 miles
• Fuel: Diesel
• Body: Convertible, 2 doors, 4 seats
• Engine: 2.0 litres, 187 bhp
• Gearbox: Automatic
• Drive: Rear-wheel drive
• Colour: Red
• CO2: 124 g/km
• Emissions standard: Euro 6, ULEZ compliant

About this car

This 2018 BMW 4 Series M Sport has covered 49,648 miles, around 13,400 fewer miles than is typical for its age. Its asking price of £16,495 is £844 above the AskCar estimate of £15,651. The AskCar estimate draws on 1,814 BMW 4 Series adverts across the UK, adjusting for age, mileage, trim, engine and other specifications. Since we first spotted the advert 75 days ago, the asking price has dropped by £1,100. Our latest MOT record expired on 2 October 2026. Check the current position with the dealer. Its advertised mileage matches the government's MOT record. The seller is Motoring WAY, based in Abertillery. 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: £844 (5%) over the AskCar estimate of £15,651.

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 75 days.

Price history

AskCar first saw this advert on 21 August 2026 at £17,595. Its asking price is now £16,495, £1,100 less. The latest price cut was seen on 23 October 2026.

Price changes recorded:

• 21 August 2026: £17,595
• 23 October 2026: £16,495

Mileage and MOT

MOT, from the government's MOT records (DVSA, the Driver and Vehicle Standards Agency), as of 4 November 2026: the latest record we hold ran out on 2 October 2026; ask the dealer for the current MOT.

It has had 6 MOTs. The latest, on 3 October 2025, passed.

There were no advisories at the latest test.

Mileage at that test: 43,385 miles, which matches the advertised 49,648 miles.

Advertised mileage is about 13,400 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: 49,000 miles. Price: £15,996, £499 less 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, black. Mileage: 44,939 miles. Price: £15,750, £745 less 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, grey. Mileage: 41,805 miles. Price: £14,750, £1,745 less than this car. Dealer: Cotswold Group Select in Tewkesbury. AskCar page: https://askcar.co.uk/car/bmw-4-series-2018-46fddfc27546