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: 33,822 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

At 33,822 miles, this 2018 BMW 4 Series M Sport has covered about 29,200 fewer miles than other 2018 BMW 4 Series cars. The dealer is asking £17,495, which is £406 above the AskCar estimate of £17,089. To work out the AskCar estimate, we analyse UK dealer adverts for 1,814 BMW 4 Series cars across different ages and specifications. This car was first seen in our listings data 18 days ago. According to the government's MOT record, its advertised mileage is consistent with the latest test. The seller is Sycamore Stamford, based in Stamford. 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: £406 (2%) over the AskCar estimate of £17,089.

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 18 days.

Price history

AskCar first saw this advert on 17 October 2026 at £17,295. Its asking price is now £17,495, £200 more.

Price changes recorded:

• 17 October 2026: £17,295
• 30 October 2026: £17,495

Mileage and MOT

MOT, from the government's MOT records (DVSA, the Driver and Vehicle Standards Agency), as of 4 November 2026: valid until 26 June 2027.

It has had 7 MOTs. The latest, on 17 June 2026, passed.

Advisories at the latest test: nearside rear child seat fitted not allowing full inspection of adult belt; offside rear child seat fitted not allowing full inspection of adult belt.

Mileage at that test: 32,285 miles, which matches the advertised 33,822 miles.

Advertised mileage is about 29,200 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, black. Mileage: 35,664 miles. Price: £15,990, £1,505 less 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. Mileage: 31,600 miles. Price: £16,795, £700 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: £16,997, £498 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

• The nearest: 2018 BMW 4 Series M Sport, 2.0 diesel convertible, black, 14 miles from this car. Mileage: 60,154 miles. Price: £14,999, £2,496 less than this car. Dealer: cinch Corby in Corby. AskCar page: https://askcar.co.uk/car/bmw-4-series-2018-c4b7bd9be6b5