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: 21,013 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 is advertised with 21,013 miles, approximately 15,000 below the typical mileage for its age. Its asking price of £136,490 is £12,528 below the AskCar estimate of £149,018. The AskCar estimate draws on 413 Mercedes-Benz G Class adverts across the UK, adjusting for age, mileage, trim, engine and other specifications. We first recorded this advert 30 days ago, and its asking price has since fallen by £3,500. According to the government's MOT record, its advertised mileage is consistent with the latest test. The seller is Group 1 Automotive Mercedes-Benz of Nottingham, based in Nottingham. 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: £12,528 (8%) under the AskCar estimate of £149,018.

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 30 days.

Price history

AskCar first saw this advert on 9 October 2026 at £139,990. Its asking price is now £136,490, £3,500 less. The latest price cut was seen on 3 November 2026.

Price changes recorded:

• 9 October 2026: £139,990
• 14 October 2026: £139,995
• 18 October 2026: £137,990
• 25 October 2026: £136,990
• 3 November 2026: £136,490

Mileage and MOT

MOT, from the government's MOT records (DVSA, the Driver and Vehicle Standards Agency), as of 8 November 2026: valid until 20 January 2027.

It has had 3 MOTs. The latest, on 20 January 2026, passed.

There were no advisories at the latest test.

Mileage at that test: 18,174 miles, which matches the advertised 21,013 miles.

Advertised mileage is about 15,000 miles lower 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: 25,000 miles. Price: £169,995, £33,505 more than this car. Dealer: My Next Car in Sandy. AskCar page: https://askcar.co.uk/car/mercedes-benz-g-class-2021-5d23a6ab20cd
• 2021 Mercedes-Benz G Class AMG, 4.0 petrol SUV, black. Mileage: 13,991 miles. Price: £83,991, £52,499 less than this car. Dealer: ASM (uk) in Redditch. AskCar page: https://askcar.co.uk/car/mercedes-benz-g-class-2021-98e081a244c6
• 2021 Mercedes-Benz G Class AMG, 4.0 petrol SUV, black. Mileage: 13,250 miles. Price: £179,995, £43,505 more than this car. Dealer: Yorkshire Motor Group in Barnsley. AskCar page: https://askcar.co.uk/car/mercedes-benz-g-class-2021-ad34fcbcf602

• The nearest: 2021 Mercedes-Benz G Class AMG, 4.0 petrol SUV, 11 miles from this car. Price: £169,950, £33,460 more than this car. Dealer: Hamilton Grays in Loughborough. AskCar page: https://askcar.co.uk/car/mercedes-benz-g-class-2021-0c7bdc2ec44f