Mercedes SL400 Valuation: 24 used car listings analysed

Market overviewPrices and data for March-2026: There are currently 24 used Mercedes SL400 (model years 2015 - 2020) available. Prices range from £19,050 to £41,990, with a median price of £29,990. The most common configuration on the market is a combination of convertible, petrol, and automatic, while the most popular trims include AMG line, AMG, AMG Line Premium. Market dynamics indicate that a vehicle sells in an average of 28 days, and 50.0% of listings have recently seen a price reduction (with discounts up to £1,205). Additionally, 7 vehicles are currently listed below market value. An indicator of durability: the inventory includes models with a mileage of up to 90,300 km (Source: 42 scanned sites).

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Looking for information on a used Mercedes SL400?

Are you interested in purchasing a used sports car? Look no further than the Mercedes SL400 - an excellent choice! On AutoUncle, you can find 22 used Mercedes SL400s for sale in the UK, each one sourced from an online marketplace or dealership website.

How much does a used Mercedes SL400 go for?

A used Mercedes SL400 costs between £19,990 for the cheapest variant and £39,995 for the most expensive model.

There are five main parameters which play a crucial role in what a pre-owned Mercedes SL400 might cost: production year, engine size and performance, the car's fuel economy, vehicle mileage and the equipment level of the car.

For instance, a younger car with a lower number on the odometer, or higher-end models with more potent engines will generally cost more than an earlier version with less equipment and higher mileage.

How many different equipment levels does the Mercedes SL400 have?

When evaluating the costs of pre-owned Mercedes SL400, it is crucial that you exclusively compare with the prices of cars with the same engine and trim level. If not, you could make a wrong decision on which car to purchase.

Which fuel variants are most in demand for the Mercedes SL400?

The Mercedes SL400 exclusively uses petrol as its fuel. We currently have twenty-two cars available at an average price of £29,416.

Assessing your driving habits is crucial before you decide on the different fuel types available. What's the average distance you drive weekly? Do you have a preference for shorter trips, or do you usually drive long distances?

For short journeys, electric cars, plug-in hybrids or petrol cars are obvious choices. For longer daily commutes, a modern electric car is often suitable - especially if you can charge at home or at work. Diesel cars can still make sense if you drive very far and don't have access to charging. Note that there are countries where diesel engines with heavy emissions are forbidden from entering city areas.

In which body styles can you buy the Mercedes SL400?

The Mercedes SL400 only comes in the cabriolet body type in the UK. Cabrios and convertibles give the driving experience a new dimension. Thanks to their excellent hoods and weather gear, most models are fit for year-round use these days. Thickener is applied underneath the car to strengthen the chassis in lieu of a roof, which means that convertibles have a tendency to be heavier than normal cars.

Are there alternatives to Mercedes SL400?

The Mercedes SL400 faces stiff competition within its segment.

Competing cars for the Mercedes SL400

  • BMW 420
  • Audi TT
  • Mazda MX5

With a selection of 1,491 available models on AutoUncle, the BMW 420 clearly stands out as the top alternative to the Mercedes SL400. On average, the BMW 420 costs £18,198.

Another popular choice in this class is the Audi TT with 949 cars on the market and an average price tag 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 adoption of an electric car?

If your choice is not strictly limited to the Mercedes SL400 then, let us show you some alternative electric car choices within the same segment. These are:

Still struggling to find an electric car that fits your taste? Examine our full lineup of electric cars here.