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 AMG Line Premium Plus Auto 4WD Euro 6 5dr (325 bhp)
• Year: 2020
• Mileage: 61,138 miles
• Fuel: Diesel
• Body: SUV, 5 doors, 7 seats
• Engine: 2.9 litres, 325 bhp
• Gearbox: Automatic
• Drive: Four-wheel drive
• Colour: Black
• 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 61,138 miles on the clock. Its asking price of £46,995 is £3,165 above the AskCar estimate of £43,830. The AskCar estimate uses 143 UK dealer adverts for the Mercedes-Benz GLS, with adjustments for age, mileage, trim, engine and other specifications. We first recorded this advert 8 days ago, and its asking price has since fallen by £1,000. According to the government's MOT record, its advertised mileage is consistent with the latest test. The seller is Mercedes-Benz South West Mercedes Benz Of Exeter, based in Exeter. 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: £3,165 (7%) over the AskCar estimate of £43,830.

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

This 2020 Mercedes-Benz GLS has been on sale for at least 8 days.

Price history

AskCar first saw this advert on 30 October 2026 at £47,995. Its asking price is now £46,995, £1,000 less. The latest price cut was seen on 7 November 2026.

Price changes recorded:

• 30 October 2026: £47,995
• 3 November 2026: £47,500
• 7 November 2026: £46,995

Mileage and MOT

MOT, from the government's MOT records (DVSA, the Driver and Vehicle Standards Agency), as of 7 November 2026: valid until 15 September 2027.

It has had 5 MOTs. The latest, on 16 September 2026, passed.

There were no advisories at the latest test.

Mileage at that test: 60,820 miles, which matches the advertised 61,138 miles.

Advertised mileage is about 600 miles higher 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: 60,000 miles. Price: £46,989, the same price as 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, blue. Mileage: 64,643 miles. Price: £42,500, £4,495 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, £3,995 less than this car. Dealer: Saxtons.co.uk in Chelmsford. AskCar page: https://askcar.co.uk/car/mercedes-benz-gls-2020-420eb62b643e