2020 Mercedes-Benz G Class 4.0 AMG
Price: £129,995. Fair price: £9,852 (7%) under the AskCar estimate of £139,847, our expected asking price for this car from its model, age, mileage and specification, drawing on 413 priced Mercedes-Benz G Class adverts on AskCar as of 8 November 2026.
AskCar lists 480 used Mercedes-Benz G Class from 282 UK dealerships, as of 8 November 2026.
Overview
- Make: Mercedes-Benz
- Model: G Class
- Trim: AMG
- Version: 4.0 AMG Auto 4WD Euro 6 5dr (577 bhp)
- Year: 2020
- Mileage: 18,000 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 18,000 miles, around 26,900 fewer miles than is typical for its age. Its asking price of £129,995 is £9,852 below the AskCar estimate of £139,847. The AskCar estimate uses 413 UK dealer adverts for the Mercedes-Benz G Class, with adjustments for age, mileage, trim, engine and other specifications. It first appeared in our advert records 111 days ago. The seller is Andreas Prestige, based in Slough. How to contact the dealer and its opening hours are on this AskCar page.
Stock data as of 8 November 2026.
Price
Fair price: £9,852 (7%) under the AskCar estimate of £139,847.
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 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 8 November 2026.
Time on sale
This 2020 Mercedes-Benz G Class has been on sale for at least 111 days.
Price history
AskCar first saw this advert on 20 July 2026 at £129,995. Its asking price has not changed.
Mileage and MOT
Advertised mileage is about 26,900 miles lower 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 8 November 2026.
The 3 closest to this car in mileage:
- 2020 Mercedes-Benz G Class AMG, 4.0 petrol SUV, green. Mileage: 25,000 miles. Price: £127,995, £2,000 less than this car. Dealer: The Motoring Team in Chesham. AskCar page: https://askcar.co.uk/car/mercedes-benz-g-class-2020-1d422cff096f
- 2020 Mercedes-Benz G Class AMG, 4.0 petrol SUV, black. Mileage: 26,000 miles. Price: £229,995, £100,000 more than this car. Dealer: Polo Prestige in Sittingbourne. AskCar page: https://askcar.co.uk/car/mercedes-benz-g-class-2020-347cd29c6b42
- 2020 Mercedes-Benz G Class AMG, 4.0 petrol SUV, black. Mileage: 28,403 miles. Price: £134,995, £5,000 more than this car. Dealer: RPM Motors (N.I.) in Belfast. AskCar page: https://askcar.co.uk/car/mercedes-benz-g-class-2020-3bd6be29b9a1
Browse all Mercedes-Benz G Class cars for sale · 2020 Mercedes-Benz G Class price guide
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Photos
27 photos of this car are on its AskCar page.
As of 8 November 2026, AskCar lists 595,762 cars and vans from 12,892 UK dealerships, read daily from dealer websites: over 99% of UK dealer used car adverts. No dealer pays to be listed.