2018 BMW 4 Series 2.0 420i M Sport

Overview

• Make: BMW
• Model: 4 Series
• Trim: M Sport
• Version: 2.0 420i M Sport Auto RWD Euro 6 2dr (Professional Media) (181 bhp)
• Year: 2018
• Mileage: 31,349 miles
• Fuel: Petrol
• Body: Convertible, 2 doors, 4 seats
• Engine: 2.0 litres, 181 bhp
• Gearbox: Automatic
• Drive: Rear-wheel drive
• Colour: Black
• CO2: 181 g/km
• Emissions standard: Euro 6, ULEZ compliant

About this car

At 31,349 miles, this 2018 BMW 4 Series M Sport has covered about 31,700 fewer miles than other 2018 BMW 4 Series cars. The AskCar estimate for this car is £16,276. It is priced at £15,760, which is £516 below that estimate. To work out the AskCar estimate, we analyse UK dealer adverts for 1,826 BMW 4 Series cars across different ages and specifications. We first recorded this advert 18 days ago, and its asking price has since fallen by £665. The government's MOT record matches its advertised mileage. You can find this car at Evans Halshaw Hyundai Milton Keynes in Newport Pagnell. How to contact the dealer and its opening hours are on this AskCar page.

Stock data as of 6 November 2026.

How we estimate prices and check cars

Price

Fair price: £516 (3%) under the AskCar estimate of £16,276.

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 1,826 priced BMW 4 Series adverts across different ages and specifications, as of 6 November 2026.

A 2018 BMW 4 Series with the 2.0 petrol engine is typically advertised at £14,500: the median of the 116 for sale on AskCar, as of 6 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 19 October 2026 at £16,425. Its asking price is now £15,760, £665 less. The latest price cut was seen on 3 November 2026.

Price changes recorded:

• 19 October 2026: £16,425
• 20 October 2026: £16,420
• 27 October 2026: £16,010
• 3 November 2026: £15,760

Mileage and MOT

MOT, from the government's MOT records (DVSA, the Driver and Vehicle Standards Agency), as of 6 November 2026: valid until 24 May 2027.

It has had 6 MOTs. The latest, on 19 May 2026, passed.

There were no advisories at the latest test.

Mileage at that test: 28,224 miles, which matches the advertised 31,349 miles.

Advertised mileage is about 31,700 miles lower than the median mileage of a 2018 BMW 4 Series on AskCar.

Similar cars

13 other 2018 BMW 4 Series M Sport 2.0 petrol automatic convertibles are for sale at UK dealers, from £14,489 to £23,995, as of 6 November 2026.

The 3 closest to this car in mileage:

• 2018 BMW 4 Series M Sport, 2.0 petrol convertible, grey. Mileage: 28,500 miles. Price: £18,265, £2,505 more than this car. Dealer: Cox Motor Group Blackpool Automart in Blackpool. AskCar page: https://askcar.co.uk/car/bmw-4-series-2018-31d6a3327406
• 2018 BMW 4 Series M Sport, 2.0 petrol convertible, white. Mileage: 28,363 miles. Price: £16,590, £830 more than this car. Dealer: Shirlton Car Sales in Cannock. AskCar page: https://askcar.co.uk/car/bmw-4-series-2018-24f01be90652
• 2018 BMW 4 Series M Sport, 2.0 petrol convertible, white. Mileage: 37,585 miles. Price: £18,000, £2,240 more than this car. Dealer: The Motoring Centre in Royal Leamington Spa. AskCar page: https://askcar.co.uk/car/bmw-4-series-2018-36368f184487

• The nearest: 2018 BMW 4 Series M Sport, 2.0 petrol convertible, blue, 36 miles from this car. Mileage: 18,400 miles. Price: £19,950, £4,190 more than this car. Dealer: JS Prestige and Performance in Enfield. AskCar page: https://askcar.co.uk/car/bmw-4-series-2018-5d9067742da5