2018 Mercedes-Benz GLS 3.0 GLS350d V6 AMG Line

Overview

• Make: Mercedes-Benz
• Model: GLS
• Trim: AMG Line
• Version: 3.0 GLS350d V6 AMG Line G-Tronic 4WD Euro 6 (s/s) 5dr (254 bhp)
• Year: 2018
• Mileage: 68,750 miles
• Fuel: Diesel
• Body: SUV, 5 doors, 7 seats
• Engine: 3.0 litres, 254 bhp
• Gearbox: Automatic (G-Tronic)
• Drive: Four-wheel drive
• Colour: White
• CO2: 199 g/km
• Emissions standard: Euro 6, ULEZ compliant

About this car

With 68,750 miles on the clock, this 2018 Mercedes-Benz GLS AMG Line has done roughly 10,400 more miles than a typical 2018 Mercedes-Benz GLS. The dealer is asking £28,989, which is £423 above the AskCar estimate of £28,566. To work out the AskCar estimate, we analyse UK dealer adverts for 143 Mercedes-Benz GLS cars across different ages and specifications. The asking price is now £1,000 lower than when we first recorded the advert 66 days ago. We checked its advertised mileage against the government's MOT record, and they match. The seller is A6 Motors, based in Bedford. How to contact the dealer and its opening hours are on this AskCar page.

Stock data as of 7 November 2026.

How we estimate prices and check cars

Price

Fair price: £423 (1%) over the AskCar estimate of £28,566.

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 143 priced Mercedes-Benz GLS adverts across different ages and specifications, as of 7 November 2026.

A 2018 Mercedes-Benz GLS with the 3.0 diesel engine is typically advertised at £30,000: the median of the 15 for sale on AskCar, as of 7 November 2026.

Time on sale

This 2018 Mercedes-Benz GLS has been on sale for at least 66 days.

Price history

AskCar first saw this advert on 2 September 2026 at £29,989. Its asking price is now £28,989, £1,000 less. The latest price cut was seen on 9 October 2026.

Price changes recorded:

• 2 September 2026: £29,989
• 9 October 2026: £28,989

Mileage and MOT

MOT, from the government's MOT records (DVSA, the Driver and Vehicle Standards Agency), as of 7 November 2026: valid until 2 February 2027.

It failed its MOT on 31 January 2026 (nearside front tyre has ply or cords exposed; front registration plate does not conform to the specified requirements; rear registration plate does not conform to the specified requirements) and passed 2 days later, on 2 February 2026.

Advisories at the latest test: offside front tyre worn close to legal limit/worn on edge; nearside rear tyre worn close to legal limit/worn on edge; offside rear tyre worn close to legal limit/worn on edge; and 1 more.

Mileage at that test: 60,550 miles, which matches the advertised 68,750 miles.

Advertised mileage is about 10,400 miles higher than the median mileage of a 2018 Mercedes-Benz GLS on AskCar.

Similar cars

10 other 2018 Mercedes-Benz GLS AMG Line 3.0 diesel automatic SUVs are for sale at UK dealers, from £23,500 to £37,500, as of 7 November 2026.

The 3 closest to this car in mileage:

• 2018 Mercedes-Benz GLS AMG Line, 3.0 diesel SUV, silver. Mileage: 73,083 miles. Price: £30,663, £1,674 more than this car. Dealer: Lookers Mercedes-Benz of Canterbury in Canterbury. AskCar page: https://askcar.co.uk/car/mercedes-benz-gls-2018-cbd84dd04d6e
• 2018 Mercedes-Benz GLS AMG Line, 3.0 diesel SUV, grey. Mileage: 59,000 miles. Price: £28,495, £494 less than this car. Dealer: Apex Motor House in Farnham. AskCar page: https://askcar.co.uk/car/mercedes-benz-gls-2018-474b7b607784
• 2018 Mercedes-Benz GLS AMG Line, 3.0 diesel SUV, black. Mileage: 57,794 miles. Price: £28,990, the same price as this car. Dealer: Penistone Motor Group in Sheffield. AskCar page: https://askcar.co.uk/car/mercedes-benz-gls-2018-f4dbcaa00e10

• The nearest: 2018 Mercedes-Benz GLS AMG Line, 3.0 diesel SUV, silver, 27 miles from this car. Mileage: 85,647 miles. Price: £25,500, £3,489 less than this car. Dealer: Car Planet Barnet in Barnet. AskCar page: https://askcar.co.uk/car/mercedes-benz-gls-2018-6dd3f15d08f4