2020 Mercedes-Benz GLS 2.9 GLS400d AMG Line Premium Plus

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: 2020
• Mileage: 60,000 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

This 2020 Mercedes-Benz GLS AMG Line Premium Plus is advertised with 60,000 miles on the clock. Priced at £46,989, it is advertised £1,521 above the AskCar estimate of £45,468. The AskCar estimate draws on 143 Mercedes-Benz GLS adverts across the UK, adjusting for age, mileage, trim, engine and other specifications. We first saw this car advertised 124 days ago. Its asking price has since fallen by £1,000. We checked its advertised mileage against the government's MOT record, and they match. The seller is Blackstone Motors, based in White City. 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: £1,521 (3%) over the AskCar estimate of £45,468.

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.

A 2020 Mercedes-Benz GLS with the 2.9 diesel engine is typically advertised at £45,400: the median of the 12 for sale on AskCar, as of 8 November 2026.

Time on sale

This 2020 Mercedes-Benz GLS has been on sale for at least 124 days.

Price history

AskCar first saw this advert on 7 July 2026 at £47,989. Its asking price is now £46,989, £1,000 less. The latest price cut was seen on 11 August 2026.

Price changes recorded:

• 7 July 2026: £47,989
• 11 August 2026: £46,989

Mileage and MOT

MOT, from the government's MOT records (DVSA, the Driver and Vehicle Standards Agency), as of 8 November 2026: valid until 15 April 2027.

It has had 4 MOTs. The latest, on 16 April 2026, passed.

There were no advisories at the latest test.

Mileage at that test: 59,091 miles, which matches the advertised 60,000 miles.

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

Similar cars

5 other 2020 Mercedes-Benz GLS AMG Line Premium Plus 2.9 diesel automatic SUVs are for sale at UK dealers, from £42,500 to £49,950, as of 8 November 2026.

The 3 closest to this car in mileage:

• 2020 Mercedes-Benz GLS AMG Line Premium Plus, 2.9 diesel SUV, black. Mileage: 61,138 miles. Price: £46,995, the same price as this car. Dealer: Mercedes-Benz South West Mercedes Benz Of Exeter in Exeter. AskCar page: https://askcar.co.uk/car/mercedes-benz-gls-2020-c549e2f61aa1
• 2020 Mercedes-Benz GLS AMG Line Premium Plus, 2.9 diesel SUV, blue. Mileage: 64,643 miles. Price: £42,500, £4,489 less than this car. Dealer: Sytner Select Northampton in Northampton. AskCar page: https://askcar.co.uk/car/mercedes-benz-gls-2020-3420a120af4c
• 2020 Mercedes-Benz GLS AMG Line Premium Plus, 2.9 diesel SUV, grey. Mileage: 66,681 miles. Price: £43,000, £3,989 less than this car. Dealer: Saxtons.co.uk in Chelmsford. AskCar page: https://askcar.co.uk/car/mercedes-benz-gls-2020-420eb62b643e