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: 47,371 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 47,371 miles, approximately 13,200 below the typical mileage for its age. Priced at £48,995, it is advertised £323 above the AskCar estimate of £48,672. To work out the AskCar estimate, we analyse UK dealer adverts for 143 Mercedes-Benz GLS cars across different ages and specifications. The asking price is now £1,000 lower than when we first recorded the advert 4 days ago. We checked its advertised mileage against the government's MOT record, and they match. The seller is JCT600 Doncaster Audi, based in Doncaster. How to contact the dealer and its opening hours are on this AskCar page.

Stock data as of 7 November 2026.

How we estimate prices and check cars

Price

Fair price: £323 (under 1%) over the AskCar estimate of £48,672.

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 7 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 7 November 2026.

Time on sale

AskCar first saw this 2020 Mercedes-Benz GLS advertised 4 days ago.

Price history

AskCar first saw this advert on 3 November 2026 at £49,995. Its asking price is now £48,995, £1,000 less. The latest price cut was seen on 7 November 2026.

Price changes recorded:

• 3 November 2026: £49,995
• 7 November 2026: £48,995

Mileage and MOT

MOT, from the government's MOT records (DVSA, the Driver and Vehicle Standards Agency), as of 7 November 2026: valid until 17 March 2027.

It has had 4 MOTs. The latest, on 3 March 2026, passed.

There were no advisories at the latest test.

Mileage at that test: 42,877 miles, which matches the advertised 47,371 miles.

Advertised mileage is about 13,200 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 7 November 2026.

The 3 closest to this car in mileage:

• 2020 Mercedes-Benz GLS AMG Line Premium Plus, 2.9 diesel SUV, grey. Mileage: 46,175 miles. Price: £49,950, £955 more than this car. Dealer: Magee Automotive in Lisburn. AskCar page: https://askcar.co.uk/car/mercedes-benz-gls-2020-9b506d0e814a
• 2020 Mercedes-Benz GLS AMG Line Premium Plus, 2.9 diesel SUV, grey. Mileage: 60,000 miles. Price: £46,989, £2,006 less than this car. Dealer: Blackstone Motors in Brent. AskCar page: https://askcar.co.uk/car/mercedes-benz-gls-2020-1986b3dd238f
• 2020 Mercedes-Benz GLS AMG Line Premium Plus, 2.9 diesel SUV, black. Mileage: 61,138 miles. Price: £46,995, £2,000 less than 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

• The nearest: 2020 Mercedes-Benz GLS AMG Line Premium Plus, 2.9 diesel SUV, blue, 90 miles from this car. Mileage: 64,643 miles. Price: £42,500, £6,495 less than this car. Dealer: Sytner Select Northampton in Northampton. AskCar page: https://askcar.co.uk/car/mercedes-benz-gls-2020-3420a120af4c