2018 Mercedes-Benz SL 3.0 SL400 V6 AMG Line

Price: £37,980. Fair price: £122 (under 1%) under the AskCar estimate of £38,102, our expected asking price for this car from its model, age, mileage and specification, drawing on 365 priced Mercedes-Benz SL adverts on AskCar as of 6 November 2026.

AskCar lists 466 used Mercedes-Benz SL from 343 UK dealerships, as of 6 November 2026.

Overview

  • Make: Mercedes-Benz
  • Model: SL
  • Trim: AMG Line
  • Version: 3.0 SL400 V6 AMG Line G-Tronic+ RWD Euro 6 (s/s) 2dr Roadster (362 bhp)
  • Year: 2018
  • Mileage: 18,000 miles
  • Fuel: Petrol
  • Body: Convertible, 2 doors, 2 seats
  • Engine: 3.0 litres, 362 bhp
  • Gearbox: Automatic (G-Tronic+)
  • Drive: Rear-wheel drive
  • Colour: Grey
  • CO2: 175 g/km
  • Emissions standard: Euro 6, ULEZ compliant

About this car

This 2018 Mercedes-Benz SL AMG Line has covered 18,000 miles. The dealer is asking £37,980, which is £122 below the AskCar estimate of £38,102. To work out the AskCar estimate, we analyse UK dealer adverts for 365 Mercedes-Benz SL cars across different ages and specifications. Since we first spotted the advert 17 days ago, the asking price has dropped by £1,000. You can find this car at Auto100.Co.Uk in Sutton-in-Ashfield. How to contact the dealer and its opening hours are on this AskCar page.

Stock data as of 6 November 2026.

How we estimate prices and check cars

Price

Fair price: £122 (under 1%) under the AskCar estimate of £38,102.

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 365 priced Mercedes-Benz SL adverts across different ages and specifications, as of 6 November 2026.

Time on sale

This 2018 Mercedes-Benz SL has been on sale for at least 17 days.

Price history

AskCar first saw this advert on 20 October 2026 at £38,980. Its asking price is now £37,980, £1,000 less. The latest price cut was seen on 6 November 2026.

Price changes recorded:

  • 20 October 2026: £38,980
  • 1 November 2026: £38,480
  • 6 November 2026: £37,980

Similar cars

3 other 2018 Mercedes-Benz SL AMG Line 3.0 petrol automatic convertibles are for sale at UK dealers, from £33,490 to £38,500, as of 6 November 2026.

The 3 closest to this car in mileage:

  • 2018 Mercedes-Benz SL AMG Line, 3.0 petrol convertible, silver. Mileage: 17,825 miles. Price: £38,500, £520 more than this car. Dealer: Penguin Cars in Shrewsbury. AskCar page: https://askcar.co.uk/car/mercedes-benz-sl-2018-6424f2cb9f9a
  • 2018 Mercedes-Benz SL AMG Line, 3.0 petrol convertible, red. Mileage: 19,333 miles. Price: £37,995, the same price as this car. Dealer: Parkway Specialist Cars in Mansfield. AskCar page: https://askcar.co.uk/car/mercedes-benz-sl-2018-7fbf8b2d131a
  • 2018 Mercedes-Benz SL AMG Line, 3.0 petrol convertible, black. Mileage: 32,075 miles. Price: £33,490, £4,490 less than this car. Dealer: Wynyard Motor Company in Stockton-on-Tees. AskCar page: https://askcar.co.uk/car/mercedes-benz-sl-2018-478dd338ba3d

Browse all Mercedes-Benz SL cars for sale · 2018 Mercedes-Benz SL price guide

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Photos

42 photos of this car are on its AskCar page.

As of 6 November 2026, AskCar lists 598,752 cars and vans from 12,905 UK dealerships, read daily from dealer websites: over 99% of UK dealer used car adverts. No dealer pays to be listed.