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: 102,000 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

With 102,000 miles on the clock, this 2021 Mercedes-Benz G Class AMG Line Premium has done roughly 65,900 more miles than a typical 2021 Mercedes-Benz G Class. The AskCar estimate for this car is £72,121. It is priced at £74,995, which is £2,874 above that estimate. The AskCar estimate uses 421 UK dealer adverts for the Mercedes-Benz G Class, with adjustments for age, mileage, trim, engine and other specifications. This car was first seen in our listings data 22 days ago. We checked its advertised mileage against the government's MOT record, and they match. It is for sale at AIR Cars in Wilmslow. How to contact the dealer and its opening hours are on this AskCar page.

Stock data as of 12 November 2026.

How we estimate prices and check cars

Price

Fair price: £2,874 (3%) over the AskCar estimate of £72,121.

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 421 priced Mercedes-Benz G Class adverts across different ages and specifications, as of 12 November 2026.

A 2021 Mercedes-Benz G Class with the 2.9 diesel engine is typically advertised at £100,000: the median of the 13 for sale on AskCar, as of 12 November 2026.

Time on sale

This 2021 Mercedes-Benz G Class has been on sale for at least 22 days.

Price history

AskCar first saw this advert on 21 October 2026 at £74,995. 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 12 November 2026: valid until 4 August 2027.

It has had 3 MOTs. The latest, on 5 August 2026, passed.

There were no advisories at the latest test.

Mileage at that test: 101,028 miles, which matches the advertised 102,000 miles.

Advertised mileage is about 65,900 miles higher than the median mileage of a 2021 Mercedes-Benz G Class on AskCar.

Similar cars

7 other 2021 Mercedes-Benz G Class AMG Line Premium 2.9 diesel automatic SUVs are for sale at UK dealers, from £86,948 to £124,995, as of 12 November 2026.

The 3 closest to this car in mileage:

• 2021 Mercedes-Benz G Class AMG Line Premium, 2.9 diesel SUV, black. Mileage: 69,000 miles. Price: £89,990, £14,995 more than this car. Dealer: Prestige Cars Of Essex in Harlow. AskCar page: https://askcar.co.uk/car/mercedes-benz-g-class-2021-8281b6832f6f
• 2021 Mercedes-Benz G Class AMG Line Premium, 2.9 diesel SUV, black. Mileage: 58,000 miles. Price: £86,948, £11,953 more than this car. Dealer: Imperials -Chelmsford in Chelmsford. AskCar page: https://askcar.co.uk/car/mercedes-benz-g-class-2021-2606851e309a
• 2021 Mercedes-Benz G Class AMG Line Premium, 2.9 diesel SUV, black. Mileage: 55,000 miles. Price: £92,999, £18,004 more than this car. Dealer: Waterways Prestige in Leighton Buzzard. AskCar page: https://askcar.co.uk/car/mercedes-benz-g-class-2021-2b0556d4427a

• The nearest: 2021 Mercedes-Benz G Class AMG Line Premium, 2.9 diesel SUV, black, 34 miles from this car. Mileage: 36,743 miles. Price: £101,650, £26,655 more than this car. Dealer: JCT600 Mercedes-Benz of Chesterfield in Chesterfield. AskCar page: https://askcar.co.uk/car/mercedes-benz-g-class-2021-816549486413