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 (s/s) 2dr (181 bhp)
• Year: 2018
• Mileage: 50,616 miles
• Fuel: Petrol
• Body: Convertible, 2 doors, 4 seats
• Engine: 2.0 litres, 181 bhp
• Gearbox: Automatic
• Drive: Rear-wheel drive
• Colour: Black
• CO2: 144 g/km
• Emissions standard: Euro 6, ULEZ compliant

About this car

With 50,616 miles on the clock, this 2018 BMW 4 Series M Sport has done roughly 12,400 fewer miles than a typical 2018 BMW 4 Series. The dealer is asking £15,999, which is £64 above the AskCar estimate of £15,935. To work out the AskCar estimate, we analyse UK dealer adverts for 1,814 BMW 4 Series cars across different ages and specifications. We first recorded this car for sale 15 days ago. Its advertised mileage matches the government's MOT record. It is for sale at The PR7 Car Company in Chorley. 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: £64 (under 1%) over the AskCar estimate of £15,935.

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 15 days.

Price history

AskCar first saw this advert on 20 October 2026 at £15,999. 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 September 2027.

It has had 7 MOTs. The latest, on 11 August 2026, passed.

There were no advisories at the latest test.

Mileage at that test: 49,741 miles, which matches the advertised 50,616 miles.

Advertised mileage is about 12,400 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, grey. Mileage: 50,500 miles. Price: £15,620, £379 less than this car. Dealer: Wimbledon Carriage Company in East Horsley. AskCar page: https://askcar.co.uk/car/bmw-4-series-2018-deb8aefb9cc2
• 2018 BMW 4 Series M Sport, 2.0 petrol convertible, grey. Mileage: 48,228 miles. Price: £14,960, £1,039 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, £1,510 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, grey, 15 miles from this car. Mileage: 28,500 miles. Price: £18,265, £2,266 more than this car. Dealer: Cox Motor Group Blackpool Automart in Blackpool. AskCar page: https://askcar.co.uk/car/bmw-4-series-2018-31d6a3327406