2021 Mercedes-Benz GLS 2.9 GLS400d AMG Line Premium Plus Executive

Price: £44,995. Fair price: £289 (under 1%) under the AskCar estimate of £45,284, our expected asking price for this car from its model, age, mileage and specification, drawing on 143 priced Mercedes-Benz GLS adverts on AskCar as of 8 November 2026.

AskCar lists 150 used Mercedes-Benz GLS from 116 UK dealerships, as of 8 November 2026.

Overview

  • Make: Mercedes-Benz
  • Model: GLS
  • Trim: AMG Line Premium Plus Executive
  • Version: 2.9 GLS400d AMG Line AMG Line Premium Plus Executive G-Tronic 4WD Euro 6 (s/s) 5dr (Premium Plus, Executive) (325 bhp)
  • Year: 2021
  • Mileage: 78,793 miles
  • Fuel: Diesel
  • Body: SUV, 5 doors, 7 seats
  • Engine: 2.9 litres, 325 bhp
  • Gearbox: Automatic (G-Tronic)
  • Drive: Four-wheel drive
  • Colour: Silver
  • CO2: 246 g/km
  • Emissions standard: Euro 6, ULEZ compliant

About this car

This 2021 Mercedes-Benz GLS AMG Line Premium Plus Executive is advertised with 78,793 miles on the clock. Its asking price of £44,995 is £289 below the AskCar estimate of £45,284. The AskCar estimate draws on 143 Mercedes-Benz GLS adverts across the UK, adjusting for age, mileage, trim, engine and other specifications. Since we first spotted the advert 155 days ago, the asking price has dropped by £7,000. The government's MOT record matches its advertised mileage. It is advertised by Iac Cars in Winchester. How to contact the dealer and its opening hours are on this AskCar page.

Stock data as of 8 November 2026.

How we estimate prices and check cars

Price

Fair price: £289 (under 1%) under the AskCar estimate of £45,284.

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 8 November 2026.

Time on sale

This 2021 Mercedes-Benz GLS has been on sale for at least 155 days.

Price history

AskCar first saw this advert on 6 June 2026 at £51,995. Its asking price is now £44,995, £7,000 less. The latest price cut was seen on 18 October 2026.

Price changes recorded:

  • 6 June 2026: £51,995
  • 16 June 2026: £49,995
  • 2 July 2026: £47,995
  • 5 September 2026: £48,995
  • 23 September 2026: £47,995
  • 30 September 2026: £46,995
  • 2 October 2026: £45,995
  • 18 October 2026: £44,995

Mileage and MOT

MOT, from the government's MOT records (DVSA, the Driver and Vehicle Standards Agency), as of 8 November 2026: valid until 18 June 2027.

It has had one MOT, on 19 June 2026, and passed.

There were no advisories at the latest test.

Mileage at that test: 77,982 miles, which matches the advertised 78,793 miles.

Similar cars

1 other 2021 Mercedes-Benz GLS AMG Line Premium Plus Executive 2.9 diesel automatic SUV is for sale at UK dealers, as of 8 November 2026.

The closest to this car in mileage:

Browse all Mercedes-Benz GLS cars for sale · 2021 Mercedes-Benz GLS price guide

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Photos

11 photos of this car are on its AskCar page.

As of 8 November 2026, AskCar lists 595,762 cars and vans from 12,892 UK dealerships, read daily from dealer websites: over 99% of UK dealer used car adverts. No dealer pays to be listed.