2021 Mercedes-Benz S Class 2.9 S350d AMG Line

Overview

• Make: Mercedes-Benz
• Model: S Class
• Trim: AMG Line
• Version: 2.9 S350d AMG Line Auto RWD Euro 6 4dr (281 bhp)
• Year: 2021
• Mileage: 44,322 miles
• Fuel: Diesel
• Body: Saloon, 4 doors, 5 seats
• Engine: 2.9 litres, 281 bhp
• Gearbox: Automatic
• Drive: Rear-wheel drive
• Colour: Black
• CO2: 173 g/km
• Emissions standard: Euro 6, ULEZ compliant

About this car

The advertised mileage for this 2021 Mercedes-Benz S Class AMG Line is 44,322 miles. Its asking price of £48,999 is £185 below the AskCar estimate of £49,184. The AskCar estimate uses 568 UK dealer adverts for the Mercedes-Benz S Class, with adjustments for age, mileage, trim, engine and other specifications. We have tracked this advert for 14 days. According to the government's MOT record, its advertised mileage is consistent with the latest test. The seller is Eastern Western Motor Group Mercedes-Benz of Edinburgh (Newbridge), based in Newbridge. 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: £185 (under 1%) under the AskCar estimate of £49,184.

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

A 2021 Mercedes-Benz S Class with the 2.9 diesel engine is typically advertised at £53,900: the median of the 22 for sale on AskCar, as of 7 November 2026.

Time on sale

This 2021 Mercedes-Benz S Class has been on sale for at least 14 days.

Price history

AskCar first saw this advert on 24 October 2026 at £48,999. 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 7 October 2027.

It has had 5 MOTs. The latest, on 8 October 2026, passed.

There were no advisories at the latest test.

Mileage at that test: 44,310 miles, which matches the advertised 44,322 miles.

Advertised mileage is about 1,700 miles higher than the median mileage of a 2021 Mercedes-Benz S Class on AskCar.

Similar cars

5 other 2021 Mercedes-Benz S Class AMG Line 2.9 diesel automatic saloons are for sale at UK dealers, from £37,995 to £56,890, as of 7 November 2026.

The 3 closest to this car in mileage:

• 2021 Mercedes-Benz S Class AMG Line, 2.9 diesel saloon, black. Mileage: 51,128 miles. Price: £46,989, £2,010 less than this car. Dealer: Essex Prestige in Harlow. AskCar page: https://askcar.co.uk/car/mercedes-benz-s-class-2021-43e897bcff30
• 2021 Mercedes-Benz S Class AMG Line, 2.9 diesel saloon, black. Mileage: 57,000 miles. Price: £39,000, £9,999 less than this car. Dealer: Car 4 Everyone in Crewe. AskCar page: https://askcar.co.uk/car/mercedes-benz-s-class-2021-b761f5549f0e
• 2021 Mercedes-Benz S Class AMG Line, 2.9 diesel saloon, black. Mileage: 22,000 miles. Price: £56,890, £7,891 more than this car. Dealer: MB Specialist in London. AskCar page: https://askcar.co.uk/car/mercedes-benz-s-class-2021-0e1b2985dac1

• The nearest: 2021 Mercedes-Benz S Class AMG Line, 2.9 diesel saloon, black, 174 miles from this car. Mileage: 100,778 miles. Price: £37,995, £11,004 less than this car. Dealer: Pavilion Motor Company in Oldham. AskCar page: https://askcar.co.uk/car/mercedes-benz-s-class-2021-d85a60cece85