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: 55,000 miles
• Fuel: Diesel
• Body: SUV, 5 doors, 5 seats
• Engine: 2.9 litres, 325 bhp
• Gearbox: Automatic
• Drive: Four-wheel drive
• Colour: Black
• 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 55,000 miles, approximately 19,000 above the typical mileage for its age. The AskCar estimate for this car is £98,528. It is priced at £92,999, which is £5,529 below 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 first saw this car advertised 164 days ago. Its asking price has since fallen by £2,996. The recorded MOT expired on 14 July 2026, so ask the dealer whether it has been renewed. According to the government's MOT record, its advertised mileage is consistent with the latest test. You can find this car at Waterways Prestige in Leighton Buzzard. 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

Fair price: £5,529 (5%) under the AskCar estimate of £98,528.

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 £95,995. Its asking price is now £92,999, £2,996 less. The latest price cut was seen on 15 September 2026.

Price changes recorded:

• 28 May 2026: £95,995
• 19 June 2026: £93,995
• 15 September 2026: £92,999

Mileage and MOT

MOT, from the government's MOT records (DVSA, the Driver and Vehicle Standards Agency), as of 8 November 2026: the latest record we hold ran out on 14 July 2026; ask the dealer for the current MOT.

It failed its MOT on 15 July 2025 (offside rear tyre tread depth below requirements of 1.6mm) and passed later the same day.

There were no advisories at the latest test.

Mileage at that test: 46,560 miles, which matches the advertised 55,000 miles.

Advertised mileage is about 19,000 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 £124,995, 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: 58,000 miles. Price: £86,948, £6,051 less than this car. Dealer: Imperials -Chelmsford in Chelmsford. AskCar page: https://askcar.co.uk/car/mercedes-benz-g-class-2021-2606851e309a
• 2021 Mercedes-Benz G Class AMG Line Premium, 2.9 diesel SUV, blue. Mileage: 50,429 miles. Price: £95,500, £2,501 more 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
• 2021 Mercedes-Benz G Class AMG Line Premium, 2.9 diesel SUV, grey. Mileage: 46,660 miles. Price: £115,495, £22,496 more than this car. Dealer: August Performance in Ingatestone. AskCar page: https://askcar.co.uk/car/mercedes-benz-g-class-2021-2d976154ba8c