2021 Mercedes-Benz G Class 2.9 G400d AMG Line Premium

Overview

• Make: Mercedes-Benz
• Model: G Class
• Trim: AMG Line Premium
• Version: 2.9 G400d AMG Line Premium Auto 4WD Euro 6 5dr (325 bhp)
• Year: 2021
• Mileage: 58,000 miles
• Fuel: Diesel
• Body: SUV, 5 doors, 5 seats
• Engine: 2.9 litres, 325 bhp
• Gearbox: Automatic
• Drive: Four-wheel drive
• Colour: Black
• CO2: 281 g/km
• Emissions standard: Euro 6, ULEZ compliant

About this car

This 2021 Mercedes-Benz G Class AMG Line Premium is advertised with 58,000 miles, approximately 22,000 above the typical mileage for its age. The AskCar estimate for this car is £96,937. It is priced at £86,948, which is £9,989 below that estimate. The AskCar estimate uses UK dealer asking prices, including 413 Mercedes-Benz G Class adverts, and accounts for the car’s age, mileage and specification. Since we first spotted the advert 106 days ago, the asking price has dropped by £5,000. We checked its advertised mileage against the government's MOT record, and they match. The seller is Imperials -Chelmsford, based 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

Good value: £9,989 (10%) under the AskCar estimate of £96,937.

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 413 priced Mercedes-Benz G Class adverts across different ages and specifications, as of 8 November 2026.

A 2021 Mercedes-Benz G Class with the 2.9 diesel engine is typically advertised at £100,900: the median of the 12 for sale on AskCar, as of 8 November 2026.

Time on sale

This 2021 Mercedes-Benz G Class has been on sale for at least 106 days.

Price history

AskCar first saw this advert on 25 July 2026 at £91,948. Its asking price is now £86,948, £5,000 less. The latest price cut was seen on 30 October 2026.

Price changes recorded:

• 25 July 2026: £91,948
• 4 August 2026: £89,948
• 30 October 2026: £86,948

Mileage and MOT

MOT, from the government's MOT records (DVSA, the Driver and Vehicle Standards Agency), as of 8 November 2026: valid until 25 February 2027.

It failed its MOT on 13 February 2026 (nearside front brake pad(s) less than 1.5 mm thick) and passed 10 days later, on 23 February 2026.

There were no advisories at the latest test.

Mileage at that test: 56,825 miles, which matches the advertised 58,000 miles.

Advertised mileage is about 22,000 miles higher than the median mileage of a 2021 Mercedes-Benz G Class on AskCar.

Similar cars

6 other 2021 Mercedes-Benz G Class AMG Line Premium 2.9 diesel automatic SUVs are for sale at UK dealers, from £89,990 to £124,995, as of 8 November 2026.

The 3 closest to this car in mileage:

• 2021 Mercedes-Benz G Class AMG Line Premium, 2.9 diesel SUV, black. Mileage: 55,000 miles. Price: £92,999, £6,051 more than this car. Dealer: Waterways Prestige in Leighton Buzzard. AskCar page: https://askcar.co.uk/car/mercedes-benz-g-class-2021-2b0556d4427a
• 2021 Mercedes-Benz G Class AMG Line Premium, 2.9 diesel SUV, blue. Mileage: 50,429 miles. Price: £95,500, £8,552 more than this car. Dealer: Sytner Group Mercedes-Benz of West London in London. AskCar page: https://askcar.co.uk/car/mercedes-benz-g-class-2021-9ccdbb759d1e
• 2021 Mercedes-Benz G Class AMG Line Premium, 2.9 diesel SUV, black. Mileage: 66,552 miles. Price: £89,990, £3,042 more than this car. Dealer: Prestige Cars Of Essex in Harlow. AskCar page: https://askcar.co.uk/car/mercedes-benz-g-class-2021-8281b6832f6f

• The nearest: 2021 Mercedes-Benz G Class AMG Line Premium, 2.9 diesel SUV, grey, 2 miles from this car. Mileage: 46,660 miles. Price: £115,495, £28,547 more than this car. Dealer: August Performance in Ingatestone. AskCar page: https://askcar.co.uk/car/mercedes-benz-g-class-2021-2d976154ba8c