2021 Mercedes-Benz G Class 2.9 G400d AMG Line Premium

Overview

• Make: Mercedes-Benz
• Model: G Class
• Trim: AMG Line Premium
• Version: 2.9 G400d AMG Line Premium Auto 4WD Euro 6 5dr (325 bhp)
• Year: 2021
• Mileage: 40,000 miles
• Fuel: Diesel
• Body: SUV, 5 doors, 5 seats
• Engine: 2.9 litres, 325 bhp
• Gearbox: Automatic
• Drive: Four-wheel drive
• Colour: Grey
• CO2: 281 g/km
• Emissions standard: Euro 6, ULEZ compliant

About this car

This 2021 Mercedes-Benz G Class AMG Line Premium is advertised with 40,000 miles on the clock. The AskCar estimate for this car is £106,887. It is priced at £124,995, which is £18,108 above that estimate. To work out the AskCar estimate, we analyse UK dealer adverts for 413 Mercedes-Benz G Class cars across different ages and specifications. We have tracked this advert for 164 days. The last MOT shows 43,806 miles, more than the advert. This is worth checking with the dealer. Its recorded MOT is valid until 29 April 2027. It is for sale at CarPlex in Hailsham. 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

Above the going rate: £18,108 (16%) over the AskCar estimate of £106,887.

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 2.9 diesel engine is typically advertised at £100,900: the median of the 12 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 164 days.

Price history

AskCar first saw this advert on 28 May 2026 at £124,995. 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 8 November 2026: valid until 29 April 2027.

It has had 3 MOTs. The latest, on 27 April 2026, passed.

There were no advisories at the latest test.

Mileage at that test: 43,806 miles. The advert says 40,000 miles, fewer than the MOT record, so ask the dealer which is right.

Advertised mileage is about 4,000 miles higher than the median mileage of a 2021 Mercedes-Benz G Class on AskCar.

Similar cars

6 other 2021 Mercedes-Benz G Class AMG Line Premium 2.9 diesel automatic SUVs are for sale at UK dealers, from £86,948 to £115,495, as of 8 November 2026.

The 3 closest to this car in mileage:

• 2021 Mercedes-Benz G Class AMG Line Premium, 2.9 diesel SUV, black. Mileage: 36,743 miles. Price: £101,750, £23,245 less than this car. Dealer: JCT600 Mercedes-Benz of Chesterfield in Chesterfield. AskCar page: https://askcar.co.uk/car/mercedes-benz-g-class-2021-816549486413
• 2021 Mercedes-Benz G Class AMG Line Premium, 2.9 diesel SUV, grey. Mileage: 46,660 miles. Price: £115,495, £9,500 less than this car. Dealer: August Performance in Ingatestone. AskCar page: https://askcar.co.uk/car/mercedes-benz-g-class-2021-2d976154ba8c
• 2021 Mercedes-Benz G Class AMG Line Premium, 2.9 diesel SUV, blue. Mileage: 50,429 miles. Price: £95,500, £29,495 less than this car. Dealer: Sytner Group Mercedes-Benz of West London in London. AskCar page: https://askcar.co.uk/car/mercedes-benz-g-class-2021-9ccdbb759d1e