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: 46,175 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 46,175 miles, approximately 14,400 below the typical mileage for its age. The dealer is asking £49,950, which is £963 above the AskCar estimate of £48,987. To work out the AskCar estimate, we analyse UK dealer adverts for 143 Mercedes-Benz GLS cars across different ages and specifications. This car was first seen in our listings data 34 days ago. According to the government's MOT record, its advertised mileage is consistent with the latest test. The seller is Magee Automotive, based in Lisburn. 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: £963 (1%) over the AskCar estimate of £48,987.

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 34 days.

Price history

AskCar first saw this advert on 5 October 2026 at £49,950. 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 8 November 2026: valid until 16 January 2027.

It has had 5 MOTs. The latest, on 14 January 2026, passed.

Advisories at the latest test: nearside rear tyre worn close to legal limit/worn on edge; offside rear tyre worn close to legal limit/worn on edge; offside front play in steering rack inner joint(s).

Mileage at that test: 40,071 miles, which matches the advertised 46,175 miles.

Advertised mileage is about 14,400 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 £48,995, 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, grey. Mileage: 47,371 miles. Price: £48,995, £955 less than this car. Dealer: JCT600 Doncaster Audi in Doncaster. AskCar page: https://askcar.co.uk/car/mercedes-benz-gls-2020-6229e6ab91a2
• 2020 Mercedes-Benz GLS AMG Line Premium Plus, 2.9 diesel SUV, grey. Mileage: 60,000 miles. Price: £46,989, £2,961 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, £2,955 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