Mercedes SL420 Valuation: 4 used car listings analysed

Market overviewPrices and data for March-2026: There are currently 4 used Mercedes SL420 (model years 1986 - 1989) available. Prices range from £13,495 to £49,995, with a median price of £34,875. The most common configuration on the market is a combination of convertible, petrol, and automatic, while the most popular trims include . Market dynamics indicate that a vehicle sells in an average of days, and 25.0% of listings have recently seen a price reduction (with discounts up to £6,500). Additionally, 0 vehicles are currently listed below market value. An indicator of durability: the inventory includes models with a mileage of up to 210,391 km (Source: 42 scanned sites).

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Interested in finding a great deal on a used Mercedes SL420?

Are you thinking of buying a used sports car? Then the Mercedes SL420 is an excellent decision. AutoUncle has 3 used Mercedes SL420s for sale in UK gathered from numerous dealership websites and online marketplaces.

What is the price of a used Mercedes SL420?

The cheapest Mercedes SL420 that is available here on AutoUncle costs £14,995, while the most expensive model is priced at £49,750.

There are five main parameters which play a crucial role in what a used Mercedes SL420 costs: the year of manufacturing, engine capacity and performance, the car's fuel economy, how much the car's odometer reads together with equipment.

For instance, a car that is newer and has fewer miles on the clock will typically command a higher price. In the same vein, models at the higher end, replete with luxurious features or more robust engines, generally come with a more substantial price tag than, for example, an older car without special equipment and with many kilometres behind it.

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Is the Mercedes SL420 available in different fuel variants?

The leading fuel choice for the Mercedes SL420 is petrol.

Your driving behavior is an important aspect to consider when selecting a fuel type. What is the usual distance you cover in a week with your car? Do you predominantly undertake short trips or longer hauls?

Electric, plug-in hybrid and petrol work well for short trips. If you drive long distances on a daily basis, an electric car is good - especially if you can charge at home or at work. For longer daily commutes, a modern electric car is often suitable - especially if you can charge at home or at work. In a few cases with long journeys and limited charging infrastructure, diesel can be a practical solution. Note that in some countries, diesel engines with high emissions are no longer allowed to enter some cities.

Are there more body variants of Mercedes SL420?

The Mercedes SL420 is only available in the cabriolet body type in the UK. If you want to add a new dimension to the driving experiences, then a cabrio or a convertible is the perfect solution. Most cabrio models can be driven year-round these days, thanks to their excellent hoods and weather gear. To strengthen the chassis to make up for the lack of roof, thickener is applied underneath the car, which means that convertibles are often heavier than normal cars.

What other comparable cars are there to Mercedes SL420?

Several vehicles that are similar to the Mercedes SL420 are available.

Competing cars for the Mercedes SL420

  • BMW 420
  • Audi TT
  • Mazda MX5

With a current inventory of 1,491 available models on AutoUncle, the BMW 420 stands out as the top alternative to the Mercedes SL420. On average, the BMW 420 costs £18,198.

The Audi TT is another popular pick, with 949 cars currently for sale and an average price of £13,199. The Mazda MX5 is the third best alternative. There are currently 556 of this car for sale in the UK with an average sales price of £15,000.

Considering the idea of going electric with your next car?

Considering something greener than the Mercedes SL420? Check out these electric alternatives from the same segment::

Still struggling to find an electric car that fits your taste? Review our entire selection of electric cars here.