2021 Mercedes-Benz GLS 2.9 GLS400d AMG Line Premium Plus Executive

Overview

• Make: Mercedes-Benz
• Model: GLS
• Trim: AMG Line Premium Plus Executive
• Version: 2.9 GLS400d AMG Line AMG Line Premium Plus Executive G-Tronic 4WD Euro 6 (s/s) 5dr (Premium Plus, Executive) (325 bhp)
• Year: 2021
• Mileage: 84,000 miles
• Fuel: Diesel
• Body: SUV, 5 doors, 7 seats
• Engine: 2.9 litres, 325 bhp
• Gearbox: Automatic (G-Tronic)
• Drive: Four-wheel drive
• Colour: Black
• CO2: 246 g/km
• Emissions standard: Euro 6, ULEZ compliant

About this car

This 2021 Mercedes-Benz GLS AMG Line Premium Plus Executive is advertised with 84,000 miles on the clock. The AskCar estimate for this car is £43,635. It is priced at £42,995, which is £640 below that estimate. The AskCar estimate draws on 143 Mercedes-Benz GLS adverts across the UK, adjusting for age, mileage, trim, engine and other specifications. Since we first spotted the advert 128 days ago, the asking price has dropped by £6,000. Its advertised mileage matches the government's MOT record. The seller is Moy Auto Services, based in Dungannon. 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: £640 (1%) under the AskCar estimate of £43,635.

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.

Time on sale

This 2021 Mercedes-Benz GLS has been on sale for at least 128 days.

Price history

AskCar first saw this advert on 3 July 2026 at £48,995. Its asking price is now £42,995, £6,000 less. The latest price cut was seen on 7 November 2026.

Price changes recorded:

• 4 July 2026: £48,995
• 15 August 2026: £46,995
• 22 August 2026: £45,995
• 6 October 2026: £43,995
• 7 November 2026: £42,995

Mileage and MOT

MOT, from the government's MOT records (DVSA, the Driver and Vehicle Standards Agency), as of 8 November 2026: valid until 6 February 2027.

It failed its MOT on 28 January 2025 and passed 10 days later, on 7 February 2025.

There were no advisories at the latest test.

Mileage at that test: 52,139 miles, which matches the advertised 84,000 miles.

Similar cars

1 other 2021 Mercedes-Benz GLS AMG Line Premium Plus Executive 2.9 diesel automatic SUV is for sale at UK dealers, as of 8 November 2026.

The closest to this car in mileage:

• 2021 Mercedes-Benz GLS AMG Line Premium Plus Executive, 2.9 diesel SUV, silver. Mileage: 78,793 miles. Price: £44,995, £2,000 more than this car. Dealer: Iac Cars in Winchester. AskCar page: https://askcar.co.uk/car/mercedes-benz-gls-2021-aec98d0c24ed