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: 44,000 miles
• Fuel: Petrol
• Body: Convertible, 2 doors, 4 seats
• Engine: 2.0 litres, 181 bhp
• Gearbox: Automatic
• Drive: Rear-wheel drive
• Colour: White
• CO2: 144 g/km
• Emissions standard: Euro 6, ULEZ compliant

About this car

With 44,000 miles on the clock, this 2018 BMW 4 Series M Sport has done roughly 19,000 fewer miles than a typical 2018 BMW 4 Series. Priced at £14,489, it is advertised £2,043 below the AskCar estimate of £16,532. 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 65 days ago, the asking price has dropped by £1,000. The government's MOT record matches its advertised mileage. It is for sale at Berengrave Services in Gillingham. 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

Good value: £2,043 (12%) under the AskCar estimate of £16,532.

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 65 days.

Price history

AskCar first saw this advert on 31 August 2026 at £15,489. Its asking price is now £14,489, £1,000 less. The latest price cut was seen on 4 November 2026.

Price changes recorded:

• 31 August 2026: £15,489
• 12 September 2026: £14,989
• 18 September 2026: £14,689
• 24 September 2026: £14,389
• 4 October 2026: £14,689
• 4 November 2026: £14,489

Mileage and MOT

MOT, from the government's MOT records (DVSA, the Driver and Vehicle Standards Agency), as of 4 November 2026: valid until 12 July 2027.

It has had 6 MOTs. The latest, on 13 July 2026, passed.

There were no advisories at the latest test.

Mileage at that test: 43,271 miles, which matches the advertised 44,000 miles.

Advertised mileage is about 19,000 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 £14,495 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: 48,228 miles. Price: £14,960, £471 more 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, blue. Mileage: 38,310 miles. Price: £16,950, £2,461 more than this car. Dealer: Anchor Cars in Reading. AskCar page: https://askcar.co.uk/car/bmw-4-series-2018-9598e684041b
• 2018 BMW 4 Series M Sport, 2.0 petrol convertible, white. Mileage: 37,585 miles. Price: £18,000, £3,511 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, 40 miles from this car. Mileage: 18,400 miles. Price: £19,950, £5,461 more than this car. Dealer: JS Prestige and Performance in Enfield. AskCar page: https://askcar.co.uk/car/bmw-4-series-2018-5d9067742da5