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: 46,660 miles
• Fuel: Diesel
• Body: SUV, 5 doors, 5 seats
• Engine: 2.9 litres, 325 bhp
• Gearbox: Automatic
• Drive: Four-wheel drive
• Colour: Grey
• 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 46,660 miles, approximately 10,700 above the typical mileage for its age. Priced at £115,495, it is advertised £12,404 above the AskCar estimate of £103,091. 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. We first recorded this advert 16 days ago, and its asking price has since fallen by £2,000. Its advertised mileage matches the government's MOT record. It is advertised by August Performance in Ingatestone. 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

Above the going rate: £12,404 (12%) over the AskCar estimate of £103,091.

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 16 days.

Price history

AskCar first saw this advert on 23 October 2026 at £117,495. Its asking price is now £115,495, £2,000 less. The latest price cut was seen on 1 November 2026.

Price changes recorded:

• 23 October 2026: £117,495
• 1 November 2026: £115,495

Mileage and MOT

MOT, from the government's MOT records (DVSA, the Driver and Vehicle Standards Agency), as of 8 November 2026: valid until 29 April 2027.

It has had 3 MOTs. The latest, on 27 April 2026, passed.

There were no advisories at the latest test.

Mileage at that test: 43,806 miles, which matches the advertised 46,660 miles.

Advertised mileage is about 10,700 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 £86,948 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, blue. Mileage: 50,429 miles. Price: £95,500, £19,995 less 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, grey. Mileage: 40,000 miles. Price: £124,995, £9,500 more than this car. Dealer: CarPlex in Hailsham. AskCar page: https://askcar.co.uk/car/mercedes-benz-g-class-2021-3852a1e9dc95
• 2021 Mercedes-Benz G Class AMG Line Premium, 2.9 diesel SUV, black. Mileage: 55,000 miles. Price: £92,999, £22,496 less 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, 2 miles from this car. Mileage: 58,000 miles. Price: £86,948, £28,547 less than this car. Dealer: Imperials -Chelmsford in Chelmsford. AskCar page: https://askcar.co.uk/car/mercedes-benz-g-class-2021-2606851e309a