2021 Mercedes-Benz GLS 2.9 GLS400d AMG Line Night Edition Executive

Overview

• Make: Mercedes-Benz
• Model: GLS
• Trim: AMG Line Night Edition Executive
• Version: 2.9 400d AMG Line Night Ed Exec 9G-Tron AMG Line Night Edition Executive Auto 4WD Euro 6 5dr (325 bhp)
• Year: 2021
• Mileage: 56,110 miles
• Fuel: Diesel
• Body: SUV, 5 doors, 7 seats
• Engine: 2.9 litres, 325 bhp
• Gearbox: Automatic
• Drive: Four-wheel drive
• Colour: Black
• CO2: 230 g/km
• Emissions standard: Euro 6, ULEZ compliant

About this car

This 2021 Mercedes-Benz GLS AMG Line Night Edition Executive has covered 56,110 miles. The dealer is asking £49,989, which is £1,812 above the AskCar estimate of £48,177. To work out the AskCar estimate, we analyse UK dealer adverts for 139 Mercedes-Benz GLS cars across different ages and specifications. We first saw this car advertised 44 days ago. Its asking price has since fallen by £1,500. We checked its advertised mileage against the government's MOT record, and they match. You can find this car at A6 Motors in Bedford. How to contact the dealer and its opening hours are on this AskCar page.

Stock data as of 11 November 2026.

How we estimate prices and check cars

Price

Fair price: £1,812 (3%) over the AskCar estimate of £48,177.

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 139 priced Mercedes-Benz GLS adverts across different ages and specifications, as of 11 November 2026.

Time on sale

This 2021 Mercedes-Benz GLS has been on sale for at least 44 days.

Price history

AskCar first saw this advert on 28 September 2026 at £51,489. Its asking price is now £49,989, £1,500 less. The latest price cut was seen on 1 November 2026.

Price changes recorded:

• 28 September 2026: £51,489
• 1 November 2026: £49,989

Mileage and MOT

MOT, from the government's MOT records (DVSA, the Driver and Vehicle Standards Agency), as of 11 November 2026: valid until 3 December 2026.

It failed its MOT on 27 November 2025 (offside rear seat belt buckle not functioning as intended third row; nearside rear tyre has ply or cords exposed; offside rear tyre has ply or cords exposed) and passed 7 days later, on 4 December 2025.

There were no advisories at the latest test.

Mileage at that test: 54,471 miles, which matches the advertised 56,110 miles.