2018 BMW 4 Series 2.0 420i M Sport

Overview

• Make: BMW
• Model: 4 Series
• Trim: M Sport
• Version: 2.0 420i GPF M Sport Auto RWD Euro 6 (s/s) 2dr (181 bhp)
• Year: 2018
• Mileage: 50,500 miles
• Fuel: Petrol
• Body: Convertible, 2 doors, 4 seats
• Engine: 2.0 litres, 181 bhp
• Gearbox: Automatic
• Drive: Rear-wheel drive
• Colour: Grey
• CO2: 143 g/km
• Emissions standard: Euro 6, ULEZ compliant

About this car

With 50,500 miles on the clock, this 2018 BMW 4 Series M Sport has done roughly 12,500 fewer miles than a typical 2018 BMW 4 Series. The dealer is asking £15,620, which is £789 above the AskCar estimate of £14,831. 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 11 days ago. The government's MOT record matches its advertised mileage. You can find this car at Wimbledon Carriage Company in Leatherhead. 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: £789 (5%) over the AskCar estimate of £14,831.

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 petrol 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 11 days.

Price history

AskCar first saw this advert on 24 October 2026 at £15,620. 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 4 February 2027.

It has had 6 MOTs. The latest, on 4 February 2026, passed.

There were no advisories at the latest test.

Mileage at that test: 48,606 miles, which matches the advertised 50,500 miles.

Advertised mileage is about 12,500 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 petrol automatic convertibles are for sale at UK dealers, from £14,489 to £23,995, as of 4 November 2026.

The 3 closest to this car in mileage:

• 2018 BMW 4 Series M Sport, 2.0 petrol convertible, black. Mileage: 50,616 miles. Price: £15,999, £379 more than this car. Dealer: The PR7 Car Company in Chorley. AskCar page: https://askcar.co.uk/car/bmw-4-series-2018-ef591eb17927
• 2018 BMW 4 Series M Sport, 2.0 petrol convertible, grey. Mileage: 48,228 miles. Price: £14,960, £660 less than this car. Dealer: Evans Halshaw Kia Hull in Kingston upon Hull. AskCar page: https://askcar.co.uk/car/bmw-4-series-2018-90668f76e700
• 2018 BMW 4 Series M Sport, 2.0 petrol convertible, white. Mileage: 44,000 miles. Price: £14,489, £1,131 less than this car. Dealer: Berengrave Services in Gillingham. AskCar page: https://askcar.co.uk/car/bmw-4-series-2018-42092cdb1ca8

• The nearest: 2018 BMW 4 Series M Sport, 2.0 petrol convertible, white, 7 miles from this car. Mileage: 66,207 miles. Price: £14,995, £625 less than this car. Dealer: ARJ Motors in Addlestone. AskCar page: https://askcar.co.uk/car/bmw-4-series-2018-97304c10d21d