2021 Mercedes-Benz S Class 3.0 S500L MHEV AMG Line

Overview

• Make: Mercedes-Benz
• Model: S Class
• Trim: AMG Line
• Version: 3.0 S500L Mhev AMG Line G-Tronic+ RWD Euro 6 (s/s) 4dr (Executive, Premium Plus) (451 bhp)
• Year: 2021
• Mileage: 18,800 miles
• Fuel: Petrol, mild hybrid
• Body: Saloon, 4 doors, 5 seats
• Engine: 3.0 litres, 451 bhp
• Gearbox: Automatic (G-Tronic+)
• Drive: Rear-wheel drive
• Colour: Black
• CO2: 171 g/km
• Emissions standard: Euro 6, ULEZ compliant

About this car

At 18,800 miles, this 2021 Mercedes-Benz S Class AMG Line has covered about 18,200 fewer miles than other 2021 Mercedes-Benz S Class cars. The dealer is asking £54,995, which is £11,987 below the AskCar estimate of £66,982. To work out the AskCar estimate, we analyse UK dealer adverts for 569 Mercedes-Benz S Class cars across different ages and specifications. This car was first seen in our listings data 38 days ago. Its advertised mileage matches the government's MOT record. The seller is Cardiff Motors, based in Cardiff. How to contact the dealer and its opening hours are on this AskCar page.

Stock data as of 2 November 2026.

How we estimate prices and check cars

Price

Good value: £11,987 (17%) under the AskCar estimate of £66,982.

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 569 priced Mercedes-Benz S Class adverts across different ages and specifications, as of 2 November 2026.

A 2021 Mercedes-Benz S Class with the 3.0 petrol engine is typically advertised at £53,900: the median of the 16 for sale on AskCar, as of 2 November 2026.

Time on sale

This 2021 Mercedes-Benz S Class has been on sale for at least 38 days.

Price history

AskCar first saw this advert on 25 September 2026 at £54,995. 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 2 November 2026: valid until 12 November 2026.

It has had 2 MOTs. The latest, on 13 November 2025, passed.

There were no advisories at the latest test.

Mileage at that test: 11,037 miles, which matches the advertised 18,800 miles.

Advertised mileage is about 18,200 miles lower than the median mileage of a 2021 Mercedes-Benz S Class on AskCar.

Similar cars

4 other 2021 Mercedes-Benz S Class AMG Line 3.0 petrol automatic saloons are for sale at UK dealers, from £41,950 to £65,950, as of 2 November 2026.

The 3 closest to this car in mileage:

• 2021 Mercedes-Benz S Class AMG Line, 3.0 petrol saloon, black. Mileage: 26,397 miles. Price: £64,391, £9,396 more than this car. Dealer: Stratstone Mercedes-Benz Of Leeds in Leeds. AskCar page: https://askcar.co.uk/car/mercedes-benz-s-class-2021-daf4ab1a715b
• 2021 Mercedes-Benz S Class AMG Line, 3.0 petrol saloon, blue. Mileage: 36,535 miles. Price: £65,950, £10,955 more than this car. Dealer: Scuderia Prestige Automobile in Camberley. AskCar page: https://askcar.co.uk/car/mercedes-benz-s-class-2021-0631e075d3e4
• 2021 Mercedes-Benz S Class AMG Line, 3.0 petrol saloon, grey. Mileage: 46,000 miles. Price: £41,950, £13,045 less than this car. Dealer: Classic Cars of Wirral in Birkenhead. AskCar page: https://askcar.co.uk/car/mercedes-benz-s-class-2021-25882bc8d55c