2021 Mercedes-Benz GLS 2.9 GLS400d AMG Line Premium Plus
Price: £56,499. Fair price: £3,264 (6%) over the AskCar estimate of £53,235, our expected asking price for this car from its model, age, mileage and specification, drawing on 134 priced Mercedes-Benz GLS adverts on AskCar as of 2 November 2026.
AskCar lists 140 used Mercedes-Benz GLS from 110 UK dealerships, as of 2 November 2026.
Overview
- Make: Mercedes-Benz
- Model: GLS
- Trim: AMG Line Premium Plus
- Version: 2.9 GLS400d AMG Line Premium Plus G-Tronic 4WD Euro 6 (s/s) 5dr (325 bhp)
- Year: 2021
- Mileage: 41,030 miles
- Fuel: Diesel
- Body: SUV, 5 doors, 7 seats
- Engine: 2.9 litres, 325 bhp
- Gearbox: Automatic (G-Tronic)
- Drive: Four-wheel drive
- Colour: Grey
- CO2: 242 g/km
- Emissions standard: Euro 6, ULEZ compliant
About this car
The advertised mileage for this 2021 Mercedes-Benz GLS AMG Line Premium Plus is 41,030 miles. Priced at £56,499, it is advertised £3,264 above the AskCar estimate of £53,235. To work out the AskCar estimate, we analyse UK dealer adverts for 134 Mercedes-Benz GLS cars across different ages and specifications. We first recorded this car for sale today. The government's MOT record matches its advertised mileage. You can find this car at Webuycarsformore.com in Newcastle Upon Tyne. How to contact the dealer and its opening hours are on this AskCar page.
Stock data as of 2 November 2026.
Price
Fair price: £3,264 (6%) over the AskCar estimate of £53,235.
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 134 priced Mercedes-Benz GLS adverts across different ages and specifications, as of 2 November 2026.
Time on sale
AskCar first saw this 2021 Mercedes-Benz GLS advertised today.
Price history
AskCar first saw this advert on 2 November 2026 at £56,499. 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 16 October 2027.
It has had 6 MOTs. The latest, on 17 October 2026, passed.
Advisories at the latest test: nearside front window excessively tinted but not adversely affecting driver's view; offside front window excessively tinted but not adversely affecting driver's view.
Mileage at that test: 40,914 miles, which matches the advertised 41,030 miles.
Browse all Mercedes-Benz GLS cars for sale · 2021 Mercedes-Benz GLS price guide
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Photos
35 photos of this car are on its AskCar page.
As of 2 November 2026, AskCar lists 586,270 cars and vans from 12,920 UK dealerships, read daily from dealer websites: over 99% of UK dealer used car adverts. No dealer pays to be listed.