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: 34,101 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 34,101 miles. Its asking price of £137,995 is £2,105 below the AskCar estimate of £140,100. The AskCar estimate uses 414 UK dealer adverts for the Mercedes-Benz G Class, with adjustments for age, mileage, trim, engine and other specifications. We first recorded this advert 37 days ago, and its asking price has since fallen by £2,000. Its advertised mileage matches the government's MOT record. The seller is Aim Autos, based in York. How to contact the dealer and its opening hours are on this AskCar page.

Stock data as of 9 November 2026.

How we estimate prices and check cars

Price

Fair price: £2,105 (1%) under the AskCar estimate of £140,100.

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 414 priced Mercedes-Benz G Class adverts across different ages and specifications, as of 9 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 9 November 2026.

Time on sale

This 2021 Mercedes-Benz G Class has been on sale for at least 37 days.

Price history

AskCar first saw this advert on 3 October 2026 at £139,995. Its asking price is now £137,995, £2,000 less. The latest price cut was seen on 7 November 2026.

Price changes recorded:

• 3 October 2026: £139,995
• 17 October 2026: £144,995
• 22 October 2026: £139,995
• 1 November 2026: £138,995
• 7 November 2026: £137,995

Mileage and MOT

MOT, from the government's MOT records (DVSA, the Driver and Vehicle Standards Agency), as of 9 November 2026: valid until 12 February 2027.

It has had 3 MOTs. The latest, on 13 February 2026, passed.

There were no advisories at the latest test.

Mileage at that test: 30,067 miles, which matches the advertised 34,101 miles.

Advertised mileage is about 1,900 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 9 November 2026.

The 3 closest to this car in mileage:

• 2021 Mercedes-Benz G Class AMG, 4.0 petrol SUV, black. Mileage: 36,000 miles. Price: £129,995, £8,000 less than this car. Dealer: First Autos in Watford. AskCar page: https://askcar.co.uk/car/mercedes-benz-g-class-2021-ef618097de07
• 2021 Mercedes-Benz G Class AMG, 4.0 petrol SUV, black. Mileage: 36,000 miles. Price: £139,850, £1,855 more than this car. Dealer: Autobahn Direct in Wembley. AskCar page: https://askcar.co.uk/car/mercedes-benz-g-class-2021-e006ff5069a1
• 2021 Mercedes-Benz G Class AMG, 4.0 petrol SUV, grey. Mileage: 30,000 miles. Price: £133,995, £4,000 less than this car. Dealer: Andreas Prestige in Hillingdon. AskCar page: https://askcar.co.uk/car/mercedes-benz-g-class-2021-57de5cb88b13

• The nearest: 2021 Mercedes-Benz G Class AMG, 4.0 petrol SUV, black, 34 miles from this car. Mileage: 13,250 miles. Price: £179,995, £42,000 more than this car. Dealer: Yorkshire Motor Group in Barnsley. AskCar page: https://askcar.co.uk/car/mercedes-benz-g-class-2021-ad34fcbcf602