2021 Mercedes-Benz S Class 2.9 S350d AMG Line
Price: £56,890. Fair price: £1,707 (3%) over the AskCar estimate of £55,183, our expected asking price for this car from its model, age, mileage and specification, drawing on 568 priced Mercedes-Benz S Class adverts on AskCar as of 7 November 2026.
AskCar lists 637 used Mercedes-Benz S Class from 447 UK dealerships, as of 7 November 2026.
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: 22,000 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
With 22,000 miles on the clock, this 2021 Mercedes-Benz S Class AMG Line has done roughly 20,600 fewer miles than a typical 2021 Mercedes-Benz S Class. The dealer is asking £56,890, which is £1,707 above the AskCar estimate of £55,183. To work out the AskCar estimate, we analyse UK dealer adverts for 568 Mercedes-Benz S Class cars across different ages and specifications. We have tracked this advert for 113 days. It is for sale at MB Specialist in Acton. How to contact the dealer and its opening hours are on this AskCar page.
Stock data as of 7 November 2026.
Price
Fair price: £1,707 (3%) over the AskCar estimate of £55,183.
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 113 days.
Price history
AskCar first saw this advert on 17 July 2026 at £56,890. Its asking price has not changed.
Mileage and MOT
Advertised mileage is about 20,600 miles lower 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 £49,995, 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: 44,322 miles. Price: £48,999, £7,891 less than this car. Dealer: Eastern Western Motor Group Mercedes-Benz of Edinburgh (Newbridge) in Edinburgh. AskCar page: https://askcar.co.uk/car/mercedes-benz-s-class-2021-907d90735f38
- 2021 Mercedes-Benz S Class AMG Line, 2.9 diesel saloon, black. Mileage: 51,128 miles. Price: £46,989, £9,901 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, £17,890 less than this car. Dealer: Car 4 Everyone in Crewe. AskCar page: https://askcar.co.uk/car/mercedes-benz-s-class-2021-b761f5549f0e
Browse all Mercedes-Benz S Class cars for sale · 2021 Mercedes-Benz S Class price guide
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- Used Mercedes-Benz S Class AMG Line prices
- Used diesel Mercedes-Benz S Class for sale
- Used Mercedes-Benz S Class for sale near Richmond upon Thames
Photos
43 photos of this car are on its AskCar page.
As of 7 November 2026, AskCar lists 601,018 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.