2021 Mercedes-Benz S Class 2.9 S350d AMG Line Premium

Overview

• Make: Mercedes-Benz
• Model: S Class
• Trim: AMG Line Premium
• Version: 2.9 S350d AMG Line Premium 9G-Tronic RWD Euro 6 4dr (281 bhp)
• Year: 2021
• Mileage: 71,581 miles
• Fuel: Diesel
• Body: Saloon, 4 doors, 5 seats
• Engine: 2.9 litres, 281 bhp
• Gearbox: Automatic (9G-Tronic)
• Drive: Rear-wheel drive
• Colour: Silver
• CO2: 177 g/km
• Emissions standard: Euro 6, ULEZ compliant

About this car

At 71,581 miles, this 2021 Mercedes-Benz S Class AMG Line Premium has covered about 29,000 more miles than other 2021 Mercedes-Benz S Class cars. Its asking price of £41,500 is £205 above the AskCar estimate of £41,295. The AskCar estimate uses 568 UK dealer adverts for the Mercedes-Benz S Class, with adjustments for age, mileage, trim, engine and other specifications. Since we first spotted the advert 163 days ago, the asking price has dropped by £8,350. According to the government's MOT record, its advertised mileage is consistent with the latest test. The seller is Sytner Select Northampton, based in Northampton. 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: £205 (under 1%) over the AskCar estimate of £41,295.

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 163 days.

Price history

AskCar first saw this advert on 28 May 2026 at £49,850. Its asking price is now £41,500, £8,350 less. The latest price cut was seen on 29 October 2026.

Price changes recorded:

• 28 May 2026: £49,850
• 17 June 2026: £49,000
• 26 June 2026: £48,500
• 23 July 2026: £48,000
• 13 August 2026: £46,500
• 22 August 2026: £46,000
• 27 August 2026: £45,900
• 10 September 2026: £45,150
• 17 September 2026: £44,500
• 26 September 2026: £43,900
• 8 October 2026: £43,400
• 16 October 2026: £42,400
• 22 October 2026: £41,900
• 29 October 2026: £41,500

Mileage and MOT

MOT, from the government's MOT records (DVSA, the Driver and Vehicle Standards Agency), as of 7 November 2026: valid until 17 May 2027.

It has had 4 MOTs. The latest, on 18 May 2026, passed.

There were no advisories at the latest test.

Mileage at that test: 71,523 miles, which matches the advertised 71,581 miles.

Advertised mileage is about 29,000 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 Premium 2.9 diesel automatic saloons are for sale at UK dealers, from £49,995 to £57,000, as of 7 November 2026.

The 3 closest to this car in mileage:

• 2021 Mercedes-Benz S Class AMG Line Premium, 2.9 diesel saloon, black. Mileage: 54,151 miles. Price: £49,995, £8,495 more than this car. Dealer: Car Hub London in Harlow. AskCar page: https://askcar.co.uk/car/mercedes-benz-s-class-2021-ebf7d6437145
• 2021 Mercedes-Benz S Class AMG Line Premium, 2.9 diesel saloon, black. Mileage: 42,881 miles. Price: £55,000, £13,500 more than this car. Dealer: Wootton Motor Company in King's Lynn. AskCar page: https://askcar.co.uk/car/mercedes-benz-s-class-2021-0d760726748c
• 2021 Mercedes-Benz S Class AMG Line Premium, 2.9 diesel saloon, grey. Mileage: 35,211 miles. Price: £53,898, £12,398 more than this car. Dealer: Arnold Clark Glasgow Corvette / Maserati / LUXE in Glasgow. AskCar page: https://askcar.co.uk/car/mercedes-benz-s-class-2021-173faff99de7