2018 BMW X6 3.0 40d M Sport

Overview

• Make: BMW
• Model: X6
• Trim: M Sport
• Version: 3.0 xDrive40d M Sport Auto 4WD Euro 6 5dr Step (308 bhp)
• Year: 2018
• Mileage: 85,000 miles
• Fuel: Diesel
• Body: SUV, 5 doors, 5 seats
• Engine: 3.0 litres, 308 bhp
• Gearbox: Automatic
• Drive: Four-wheel drive
• Colour: Black
• CO2: 183 g/km
• Emissions standard: Euro 6, ULEZ compliant

About this car

With 85,000 miles on the clock, this 2018 BMW X6 M Sport has done roughly 21,900 more miles than a typical 2018 BMW X6. The dealer is asking £19,950, which is £369 below the AskCar estimate of £20,319. To work out the AskCar estimate, we analyse UK dealer adverts for 536 BMW X6 cars across different ages and specifications. We have tracked this advert for 17 days. According to the government's MOT record, its advertised mileage is consistent with the latest test. The seller is Best4U Motors, based in Brentwood. How to contact the dealer and its opening hours are on this AskCar page.

Stock data as of 2 November 2026.

How we estimate prices and check cars

Price

Fair price: £369 (1%) under the AskCar estimate of £20,319.

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 536 priced BMW X6 adverts across different ages and specifications, as of 2 November 2026.

A 2018 BMW X6 with the 3.0 diesel engine is typically advertised at £22,000: the median of the 52 for sale on AskCar, as of 2 November 2026.

Time on sale

This 2018 BMW X6 has been on sale for at least 17 days.

Price history

AskCar first saw this advert on 16 October 2026 at £19,950. 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 2 November 2026: valid until 11 June 2027.

It failed its MOT on 12 June 2026 (nearside front lower suspension arm ball joint excessively worn; offside front upper suspension arm pin or bush excessively worn) and passed later the same day.

There were no advisories at the latest test.

Mileage at that test: 84,562 miles, which matches the advertised 85,000 miles.

Advertised mileage is about 21,900 miles higher than the median mileage of a 2018 BMW X6 on AskCar.

Similar cars

31 other 2018 BMW X6 M Sport 3.0 diesel automatic SUVs are for sale at UK dealers, from £13,995 to £29,995, as of 2 November 2026.

The 3 closest to this car in mileage:

• 2018 BMW X6 M Sport, 3.0 diesel SUV, black. Mileage: 85,000 miles. Price: £23,995, £4,045 more than this car. Dealer: Firstgear Cars in Hoddesdon. AskCar page: https://askcar.co.uk/car/bmw-x6-2018-73570c60d81b
• 2018 BMW X6 M Sport, 3.0 diesel SUV, black. Mileage: 85,086 miles. Price: £18,745, £1,205 less than this car. Dealer: Georgesons Car Sales in Liverpool. AskCar page: https://askcar.co.uk/car/bmw-x6-2018-9c58d000e21c
• 2018 BMW X6 M Sport, 3.0 diesel SUV, white. Mileage: 84,610 miles. Price: £19,850, £100 less than this car. Dealer: Parkside Motors in Edgware. AskCar page: https://askcar.co.uk/car/bmw-x6-2018-331b3ac14e91