2020 Mercedes-Benz GLS 2.9 GLS400d AMG Line Premium Plus Executive

Price: £53,958. Fair price: £2,862 (5%) over the AskCar estimate of £51,096, our expected asking price for this car from its model, age, mileage and specification, drawing on 138 priced Mercedes-Benz GLS adverts on AskCar as of 12 November 2026.

AskCar lists 144 used Mercedes-Benz GLS from 111 UK dealerships, as of 12 November 2026.

Overview

  • Make: Mercedes-Benz
  • Model: GLS
  • Trim: AMG Line Premium Plus Executive
  • Version: 2.9 AMG Line Premium Plus Executive Auto 4WD Euro 6 5dr (325 bhp)
  • Year: 2020
  • Mileage: 40,440 miles
  • Fuel: Diesel
  • Body: SUV, 5 doors, 7 seats
  • Engine: 2.9 litres, 325 bhp
  • Gearbox: Automatic
  • Drive: Four-wheel drive
  • Colour: Grey
  • Emissions standard: Euro 6, ULEZ compliant

About this car

This 2020 Mercedes-Benz GLS AMG Line Premium Plus Executive has covered 40,440 miles, around 16,600 fewer miles than is typical for its age. The AskCar estimate for this car is £51,096. It is priced at £53,958, which is £2,862 above that estimate. The AskCar estimate draws on 138 Mercedes-Benz GLS adverts across the UK, adjusting for age, mileage, trim, engine and other specifications. This car was first seen in our listings data today. The seller is Vertu Mercedes Slough, based in Slough. How to contact the dealer and its opening hours are on this AskCar page.

Stock data as of 12 November 2026.

How we estimate prices and check cars

Vertu Mercedes Slough is rated 3.8 out of 5 on Google.

Price

Fair price: £2,862 (5%) over the AskCar estimate of £51,096.

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 138 priced Mercedes-Benz GLS adverts across different ages and specifications, as of 12 November 2026.

A 2020 Mercedes-Benz GLS with the 2.9 diesel engine is typically advertised at £46,300: the median of the 12 for sale on AskCar, as of 12 November 2026.

Time on sale

AskCar first saw this 2020 Mercedes-Benz GLS advertised today.

Price history

AskCar first saw this advert on 12 November 2026 at £53,958. Its asking price has not changed.

Mileage and MOT

Advertised mileage is about 16,600 miles lower than the median mileage of a 2020 Mercedes-Benz GLS on AskCar.

Similar cars

1 other 2020 Mercedes-Benz GLS AMG Line Premium Plus Executive 2.9 diesel automatic SUV is for sale at UK dealers, as of 12 November 2026.

The closest to this car in mileage:

Browse all Mercedes-Benz GLS cars for sale · 2020 Mercedes-Benz GLS price guide

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Photos

1 photo of this car is on its AskCar page.

As of 12 November 2026, AskCar lists 596,362 cars and vans from 12,840 UK dealerships, read daily from dealer websites: over 99% of UK dealer used car adverts. No dealer pays to be listed.