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: 85,647 miles
• Fuel: Diesel
• Body: SUV, 5 doors, 7 seats
• Engine: 3.0 litres, 254 bhp
• Gearbox: Automatic (G-Tronic)
• Drive: Four-wheel drive
• Colour: Silver
• CO2: 199 g/km
• Emissions standard: Euro 6, ULEZ compliant

About this car

This 2018 Mercedes-Benz GLS AMG Line has covered 85,647 miles, around 27,300 more miles than is typical for its age. The AskCar estimate for this car is £25,324. It is priced at £25,500, which is £176 above that estimate. To work out the AskCar estimate, we analyse UK dealer adverts for 143 Mercedes-Benz GLS cars across different ages and specifications. We first recorded this advert 42 days ago, and its asking price has since fallen by £900. The government's MOT record matches its advertised mileage. It is advertised by Car Planet Barnet in New Southgate. 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: £176 (under 1%) over the AskCar estimate of £25,324.

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 42 days.

Price history

AskCar first saw this advert on 26 September 2026 at £26,400. Its asking price is now £25,500, £900 less. The latest price cut was seen on 5 November 2026.

Price changes recorded:

• 26 September 2026: £26,400
• 23 October 2026: £26,100
• 30 October 2026: £25,800
• 5 November 2026: £25,500

Mileage and MOT

MOT, from the government's MOT records (DVSA, the Driver and Vehicle Standards Agency), as of 7 November 2026: valid until 6 December 2026.

It has had 6 MOTs. The latest, on 22 November 2025, passed.

There were no advisories at the latest test.

Mileage at that test: 80,099 miles, which matches the advertised 85,647 miles.

Advertised mileage is about 27,300 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, £5,163 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, white. Mileage: 68,750 miles. Price: £28,989, £3,489 more than this car. Dealer: A6 Motors in Luton. AskCar page: https://askcar.co.uk/car/mercedes-benz-gls-2018-c1d4836b79e9
• 2018 Mercedes-Benz GLS AMG Line, 3.0 diesel SUV, black. Mileage: 108,190 miles. Price: £23,500, £2,000 less than this car. Dealer: Rainford Cars in Ellesmere Port. AskCar page: https://askcar.co.uk/car/mercedes-benz-gls-2018-3da88d8aea1b

• The nearest: 2018 Mercedes-Benz GLS AMG Line, 3.0 diesel SUV, white, 27 miles from this car. Mileage: 51,411 miles. Price: £31,300, £5,800 more than this car. Dealer: Saxtons.co.uk in Chelmsford. AskCar page: https://askcar.co.uk/car/mercedes-benz-gls-2018-24629538050e