2021 Mercedes-Benz G Class 4.0 AMG

Overview

• Make: Mercedes-Benz
• Model: G Class
• Trim: AMG
• Version: 4.0 G 63 AMG 9G-Tronic 4WD Euro 6 5dr Speedshift Plus (576 bhp)
• Year: 2021
• Mileage: 48,000 miles
• Fuel: Petrol
• Body: SUV, 5 doors, 5 seats
• Engine: 4.0 litres, 576 bhp
• Gearbox: Automatic (9G-Tronic)
• Drive: Four-wheel drive
• Colour: Black
• CO2: 369 g/km
• Emissions standard: Euro 6, ULEZ compliant

About this car

This 2021 Mercedes-Benz G Class AMG has covered 48,000 miles, around 12,000 more miles than is typical for its age. Priced at £139,999, it is advertised £10,004 above the AskCar estimate of £129,995. 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 car for sale 164 days ago. According to the government's MOT record, its advertised mileage is consistent with the latest test. You can find this car at David Ascott Motors in Greenford. 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: £10,004 (7%) over the AskCar estimate of £129,995.

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 4.0 petrol engine is typically advertised at £136,200: the median of the 30 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 164 days.

Price history

AskCar first saw this advert on 28 May 2026 at £134,999. Its asking price is now £139,999, £5,000 more.

Price changes recorded:

• 28 May 2026: £134,999
• 25 September 2026: £139,999

Mileage and MOT

MOT, from the government's MOT records (DVSA, the Driver and Vehicle Standards Agency), as of 8 November 2026: valid until 4 May 2027.

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

There were no advisories at the latest test.

Mileage at that test: 47,911 miles, which matches the advertised 48,000 miles.

Advertised mileage is about 12,000 miles higher than the median mileage of a 2021 Mercedes-Benz G Class on AskCar.

Similar cars

19 other 2021 Mercedes-Benz G Class AMG 4.0 petrol automatic SUVs are for sale at UK dealers, from £83,991 to £179,995, as of 8 November 2026.

The 3 closest to this car in mileage:

• 2021 Mercedes-Benz G Class AMG, 4.0 petrol SUV, black. Mileage: 43,950 miles. Price: £127,475, £12,524 less than this car. Dealer: Portland Of Bawtry in Doncaster. AskCar page: https://askcar.co.uk/car/mercedes-benz-g-class-2021-a453556f4cc1
• 2021 Mercedes-Benz G Class AMG, 4.0 petrol SUV, black. Mileage: 41,640 miles. Price: £134,995, £5,004 less than this car. Dealer: My Next Car in Sandy. AskCar page: https://askcar.co.uk/car/mercedes-benz-g-class-2021-1a104d82e5a7
• 2021 Mercedes-Benz G Class AMG, 4.0 petrol SUV, black. Mileage: 36,000 miles. Price: £129,995, £10,004 less than this car. Dealer: First Autos in Watford. AskCar page: https://askcar.co.uk/car/mercedes-benz-g-class-2021-ef618097de07

• The nearest: 2021 Mercedes-Benz G Class AMG, 4.0 petrol SUV, black, 2 miles from this car. Mileage: 36,000 miles. Price: £139,850, £149 less than this car. Dealer: Autobahn Direct in Wembley. AskCar page: https://askcar.co.uk/car/mercedes-benz-g-class-2021-e006ff5069a1