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: 36,000 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 36,000 miles. The dealer is asking £139,850, which is £1,202 above the AskCar estimate of £138,648. To work out the AskCar estimate, we analyse UK dealer adverts for 408 Mercedes-Benz G Class cars across different ages and specifications. We have tracked this advert for 43 days. Ask the dealer why the advert shows fewer miles than the 38,390 recorded at the latest MOT. MOT records show an expiry date of 5 April 2027. The seller is Autobahn Direct, based in Wembley. How to contact the dealer and its opening hours are on this AskCar page.

Stock data as of 7 November 2026.

How we estimate prices and check cars

Price

Fair price: £1,202 (under 1%) over the AskCar estimate of £138,648.

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 408 priced Mercedes-Benz G Class adverts across different ages and specifications, as of 7 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 7 November 2026.

Time on sale

This 2021 Mercedes-Benz G Class has been on sale for at least 43 days.

Price history

AskCar first saw this advert on 25 September 2026 at £139,850. 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 7 November 2026: valid until 5 April 2027.

It has had 4 MOTs. The latest, on 6 April 2026, passed.

There were no advisories at the latest test.

Mileage at that test: 38,390 miles. The advert says 36,000 miles, fewer than the MOT record, so ask the dealer which is right.

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 7 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, £9,855 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: 34,101 miles. Price: £137,995, £1,855 less than this car. Dealer: Aim Autos in Tockwith. AskCar page: https://askcar.co.uk/car/mercedes-benz-g-class-2021-947861f33125
• 2021 Mercedes-Benz G Class AMG, 4.0 petrol SUV, black. Mileage: 41,640 miles. Price: £134,995, £4,855 less than this car. Dealer: My Next Car in Sandy. AskCar page: https://askcar.co.uk/car/mercedes-benz-g-class-2021-1a104d82e5a7

• The nearest: 2021 Mercedes-Benz G Class AMG, 4.0 petrol SUV, black, 2 miles from this car. Mileage: 12,719 miles. Price: £135,995, £3,855 less than this car. Dealer: MB Specialist in London. AskCar page: https://askcar.co.uk/car/mercedes-benz-g-class-2021-521cdaf18a5d