2021 Mercedes-Benz GLS 2.9

Price: £46,995. Fair price: £1,157 (2%) over the AskCar estimate of £45,838, 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
  • Version: 2.9 Auto 4WD Euro 6 5dr
  • Year: 2021
  • Mileage: 66,752 miles
  • Fuel: Diesel
  • Body: SUV, 5 doors, 7 seats
  • Engine: 2.9 litres
  • Gearbox: Automatic
  • Drive: Four-wheel drive
  • Colour: Grey
  • Emissions standard: Euro 6, ULEZ compliant

About this car

The advertised mileage for this 2021 Mercedes-Benz GLS is 66,752 miles. Its asking price of £46,995 is £1,157 above the AskCar estimate of £45,838. The AskCar estimate uses UK dealer asking prices, including 143 Mercedes-Benz GLS adverts, and accounts for the car’s age, mileage and specification. We have tracked this advert for 5 days. The seller is Stonehouse Motor Company, based in Stonehouse. 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: £1,157 (2%) over the AskCar estimate of £45,838.

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

AskCar first saw this 2021 Mercedes-Benz GLS advertised 5 days ago.

Price history

AskCar first saw this advert on 3 November 2026 at £46,995. Its asking price has not changed.

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

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Photos

47 photos of this car are on its AskCar page.

As of 8 November 2026, AskCar lists 595,629 cars and vans from 12,891 UK dealerships, read daily from dealer websites: over 99% of UK dealer used car adverts. No dealer pays to be listed.