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: 66,681 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

With 66,681 miles on the clock, this 2020 Mercedes-Benz GLS AMG Line Premium Plus has done roughly 6,100 more miles than a typical 2020 Mercedes-Benz GLS. Its asking price of £43,000 is £354 below the AskCar estimate of £43,354. The AskCar estimate draws on 143 Mercedes-Benz GLS adverts across the UK, adjusting for age, mileage, trim, engine and other specifications. It first appeared in our advert records 15 days ago. The government's MOT record matches its advertised mileage. It is advertised by Saxtons.co.uk in Chelmsford. 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: £354 (under 1%) under the AskCar estimate of £43,354.

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 15 days.

Price history

AskCar first saw this advert on 24 October 2026 at £43,000. 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 7 November 2027.

It has had 3 MOTs. The latest, on 22 October 2026, passed.

There were no advisories at the latest test.

Mileage at that test: 66,608 miles, which matches the advertised 66,681 miles.

Advertised mileage is about 6,100 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 8 November 2026.

The 3 closest to this car in mileage:

• 2020 Mercedes-Benz GLS AMG Line Premium Plus, 2.9 diesel SUV, blue. Mileage: 64,643 miles. Price: £42,500, £500 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, black. Mileage: 61,138 miles. Price: £46,995, £3,995 more 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
• 2020 Mercedes-Benz GLS AMG Line Premium Plus, 2.9 diesel SUV, grey. Mileage: 60,000 miles. Price: £46,989, £3,989 more than this car. Dealer: Blackstone Motors in Brent. AskCar page: https://askcar.co.uk/car/mercedes-benz-gls-2020-1986b3dd238f