Mercedes SLK230 Valuation: 98 used car listings analysed

Market overviewPrices and data for March-2026: There are currently 98 used Mercedes SLK230 (model years 1997 - 2004) available. Prices range from £2,295 to £4,995, with a median price of £3,495. The most common configuration on the market is a combination of convertible, petrol, and automatic, while the most popular trims include Edition. Market dynamics indicate that a vehicle sells in an average of 39 days, and 3.1% of listings have recently seen a price reduction (with discounts up to £5). Additionally, 4 vehicles are currently listed below market value. An indicator of durability: the inventory includes models with a mileage of up to 127,000 km (Source: 42 scanned sites).

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Showing 1 - 25 of 98 results

How much does the Mercedes SLK230 depreciate?

Used Mercedes SLK230

A used Mercedes SLK230 (1999) model gains about £3 per month in value.


Factors that affect the appreciation of a Mercedes SLK230:
- Mileage
- Age of the vehicle
- Number of previous owners
- Accidents or damage history
- Trim level, equipment, and options


Appreciation is an important part of calculating the total value of owning a Mercedes SLK230. In addition to the monthly appreciation of £3, you should also factor in fuel costs, road tax, insurance and maintenance (including tyres and car washes) to get the full monthly value.

Comparison of Mercedes SLK230 variants and prices

No market data available

Mercedes SLK230 (model year 1999) - Price development for the last 12 months and price projection for the next 6 months (March 2025 - August 2026)

Monthly price data with average prices and price ranges

Month

Average market price

Lowest market price

Highest market price

Calculation method

2025 - March
£3,400
£2,900£3,880
Estimate
2025 - April
£3,400
£2,900£3,880
Estimate
2025 - May
£3,380
£2,900£3,860
Estimate
2025 - June
£3,500
£3,060£3,920
Estimate
2025 - July
£3,480
£3,020£3,940
Estimate
2025 - August
£3,460
£3,020£3,880
Estimate
2025 - September
£3,440
£2,980£3,880
Estimate
2025 - October
£3,420
£2,960£3,880
Estimate
2025 - November
£3,420
£3,000£3,860
Estimate
2025 - December
£3,400
£2,980£3,840
Estimate
2026 - January
£3,420
£3,020£3,840
Estimate
2026 - February
£3,440
£3,040£3,840
Estimate
2026 - April
£3,440
--
Forecast
2026 - May
£3,440
--
Forecast
2026 - June
£3,440
--
Forecast
2026 - July
£3,440
--
Forecast
2026 - August
£3,440
--
Forecast

All estimates and forecasts are based on actual market data

Last updated: 14 March 2026

Average Monthly Depreciation

A summary of the past 12 and an estimation of the next 6 months.

Past 12 months

£40

Next 6 months

£0

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Price checked by AutoUncle

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Good price

Fair price

A bit pricey

Expensive

On the hunt for a used Mercedes SLK230?

Are you thinking of purchasing a used sports car? Look no further than the Mercedes SLK230 - an excellent choice! AutoUncle present 98 options sourced from numerous dealership websites and online marketplaces.

What is the used car price of the Mercedes SLK230?

A used Mercedes SLK230 costs between £2,295 for the cheapest variant and £5,490 for the most expensive model.

A used Mercedes SLK230 is being offered at different prices determined by mainly five factors: manufacturing year, engine size and power, the car's fuel consumption, mileage along with equipment variant.

For example, a newer model with low mileage or a premium version equipped with a high-performance engine generally demands a higher price than, for example, an older car without special equipment and with many kilometres behind it.

What are the available trim levels for the Mercedes SLK230?

The Mercedes SLK230 is only available in one trim level, the Mercedes SLK230 Edition.

When examining the market value of a used Mercedes SLK230, it's imperative to analyze vehicles having the same engines and equipment. If not, you might draw an inaccurate conclusion about which car to buy.

Which fuel options are available for Mercedes SLK230?

Petrol is the singular fuel variant for the Mercedes SLK230. We currently offer ninety-eight cars at an average price of £3,549.

We strongly advise considering your driving habits prior to choosing among the various fuel types. How many miles do you typically drive each week? Are your drives mostly short trips, or do you tend to embark on longer routes?

If you primarily drive short distances, electric, plug-in hybrid or petrol is typically a good fit. For longer commutes, a newer electric car is a good alternative - especially with access to charging. If you have a daily commute over longer distances, a modern electric car can be a great choice - especially if you have access to charging at home or at work. Despite the rise of electric cars, diesel can still be useful for long journeys and lack of charging options. Note that in some countries, high-emission diesel engines have been banned from entering certain cities.

What body types do the Mercedes SLK230 have?

The Mercedes SLK230 is only offered in the cabriolet body type in the UK. Cabrios and convertibles elevate the driving experience, offering an open-air thrill. Nowadays, many cabrios are suitable for year-round driving due to their high-quality hoods and weatherproofing. However, it's worth noting that convertibles tend to be heavier than standard cars. The absence of a roof often necessitates additional reinforcement to the undercarriage to bolster the chassis.

What other competing models to the Mercedes SLK230 are there?

The Mercedes SLK230 has several competitors from the same segment.

Recommended alternatives to the Mercedes SLK230

  • 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 SLK230. On average, the BMW 420 costs £18,198.

Another alternative car is the Audi TT with 949 cars currently for sale with an average sales 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 adoption of an electric car?

If the Mercedes SLK230 not is your definitive choice then, we can provide several electric vehicle alternatives of the same car segment, the S-segment. The list includes:

Haven't spotted the perfect electric car yet? Examine our full lineup of electric cars here.

All gear types for Mercedes SLK230