1999 Mercedes-Benz SL 3.2 SL320
Price: £14,995. Far below the going rate: £10,419 (41%) under the AskCar estimate of £25,414, our expected asking price for this car from its model, age, mileage and specification, drawing on 371 priced Mercedes-Benz SL adverts on AskCar as of 7 November 2026. Worth asking the dealer why.
AskCar lists 467 used Mercedes-Benz SL from 341 UK dealerships, as of 7 November 2026.
Overview
- Make: Mercedes-Benz
- Model: SL
- Version: 3.2 SL320 Auto RWD 2dr
- Year: 1999
- Mileage: 320 miles
- Fuel: Petrol
- Body: Convertible, 2 doors
- Engine: 3.2 litres
- Gearbox: Automatic
- Drive: Rear-wheel drive
- Colour: Blue
About this car
This 1999 Mercedes-Benz SL has covered 320 miles. Priced at £14,995, this car is advertised £10,419 below the AskCar estimate of £25,414. This is a large price difference, so check the price and vehicle details with the dealer. To work out the AskCar estimate, we analyse UK dealer adverts for 371 Mercedes-Benz SL cars across different ages and specifications. We first recorded this car for sale 87 days ago. The latest MOT recorded 57,564 miles, above the advertised mileage. Check this with the dealer. MOT records show an expiry date of 9 December 2026. It is advertised by Williams Commercials in Conwy. How to contact the dealer and its opening hours are on this AskCar page.
Stock data as of 7 November 2026.
Price
Far below the going rate: £10,419 (41%) under the AskCar estimate of £25,414. Worth asking the dealer why.
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 371 priced Mercedes-Benz SL adverts across different ages and specifications, as of 7 November 2026.
Time on sale
This 1999 Mercedes-Benz SL has been on sale for at least 87 days.
Price history
AskCar first saw this advert on 12 August 2026 at £14,995. 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 7 November 2026: valid until 9 December 2026.
It has had 22 MOTs. The latest, on 13 November 2025, passed.
There were no advisories at the latest test.
Mileage at that test: 57,564 miles. The advert says 320 miles, fewer than the MOT record, so ask the dealer which is right.
Advertised mileage is about 73,700 miles lower than the median mileage of a 1999 Mercedes-Benz SL on AskCar.
The advertised mileage of 320 miles looks wrong for a 1999 car; check it with the dealer.
Browse all Mercedes-Benz SL cars for sale · 1999 Mercedes-Benz SL price guide
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Photos
34 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.