2020 Mercedes-Benz G Class 4.0 G63 V8 BiTurbo AMG

Overview

• Make: Mercedes-Benz
• Model: G Class
• Trim: AMG
• Version: 4.0 G63 V8 BiTurbo AMG Auto 4WD Euro 6 (s/s) 5dr SpdS+9GT (577 bhp)
• Year: 2020
• Mileage: 46,600 miles
• Fuel: Petrol
• Body: SUV, 5 doors, 5 seats
• Engine: 4.0 litres, 577 bhp
• Gearbox: Automatic
• Drive: Four-wheel drive
• Colour: Black
• Emissions standard: Euro 6, ULEZ compliant

About this car

This 2020 Mercedes-Benz G Class AMG has covered 46,600 miles. The dealer is asking £116,990, which is £6,493 below the AskCar estimate of £123,483. To work out the AskCar estimate, we analyse UK dealer adverts for 408 Mercedes-Benz G Class cars across different ages and specifications. We first saw this car advertised 145 days ago. Its asking price has since fallen by £8,000. The seller is Southport Motor Company, based in Southport. 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: £6,493 (5%) under the AskCar estimate of £123,483.

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 2020 Mercedes-Benz G Class with the 4.0 petrol engine is typically advertised at £125,000: the median of the 31 for sale on AskCar, as of 7 November 2026.

Time on sale

This 2020 Mercedes-Benz G Class has been on sale for at least 145 days.

Price history

AskCar first saw this advert on 15 June 2026 at £124,990. Its asking price is now £116,990, £8,000 less. The latest price cut was seen on 29 September 2026.

Price changes recorded:

• 3 July 2026: £124,990
• 4 July 2026: £123,990
• 22 July 2026: £122,990
• 20 August 2026: £121,990
• 1 September 2026: £120,990
• 8 September 2026: £119,990
• 21 September 2026: £117,990
• 29 September 2026: £116,990

Mileage and MOT

Advertised mileage is about 1,700 miles higher than the median mileage of a 2020 Mercedes-Benz G Class on AskCar.

Similar cars

26 other 2020 Mercedes-Benz G Class AMG 4.0 petrol automatic SUVs are for sale at UK dealers, from £107,949 to £240,000, as of 7 November 2026.

The 3 closest to this car in mileage:

• 2020 Mercedes-Benz G Class AMG, 4.0 petrol SUV, black. Mileage: 46,282 miles. Price: £123,950, £6,960 more than this car. Dealer: Car Planet Barnet in Barnet. AskCar page: https://askcar.co.uk/car/mercedes-benz-g-class-2020-940827641202
• 2020 Mercedes-Benz G Class AMG, 4.0 petrol SUV, silver. Mileage: 47,000 miles. Price: £129,995, £13,005 more than this car. Dealer: Driven Motor Company in Glasgow. AskCar page: https://askcar.co.uk/car/mercedes-benz-g-class-2020-99e5e65e91dc
• 2020 Mercedes-Benz G Class AMG, 4.0 petrol SUV, black. Mileage: 44,557 miles. Price: £130,000, £13,010 more than this car. Dealer: Strafford Cars in Brighton and Hove. AskCar page: https://askcar.co.uk/car/mercedes-benz-g-class-2020-2c27596b4dbd

• The nearest: 2020 Mercedes-Benz G Class AMG, 4.0 petrol SUV, black, 33 miles from this car. Mileage: 36,295 miles. Price: £121,995, £5,005 more than this car. Dealer: Warford Cars in Altrincham. AskCar page: https://askcar.co.uk/car/mercedes-benz-g-class-2020-9b24530fd930