CarCostCheck

MERCEDES SLK (2004)

Running costs, common problems, and reliability data based on 6,598 real MOT tests in 2024.

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MOT Pass Rate

78%

Total Tests (2024)

6,598

Avg Mileage

84,132 mi

Est. Annual Cost

£2,397

Is the 2004 MERCEDES SLK reliable?

Average reliability. Expect some repairs as it ages. That's close to the national average of 82%. It falls below the MERCEDES brand average of 87%.

At 20 years old, 78% of MERCEDES SLKs from 2004 passed their MOT first time in 2024. That's based on 6,598 tests across the UK. The average mileage at this age is 84,132 miles.

How does the 2004 MERCEDES SLK compare?

Rank among all 2004 cars152th out of 491(top 31%)
Rank among all MERCEDES models1151th out of 1,408(top 82%)
vs national average-4% (82% avg)
vs 2004 cars average+6% (72% avg)
vs MERCEDES average-9% (87% avg)

Mileage Analysis

The average 2004 MERCEDES SLK has 84,132 miles on the clock, which is below the expected 148,000 miles for a 20-year-old car. This suggests lighter use than average, which generally means less wear on major components.

Best year to buy a MERCEDES SLK?

The most reliable year is the 2016 model with a 89% MOT pass rate, while the 1996 model has the lowest at 76%. The 2004 sits between the two at 78%.

How much does a 2004 MERCEDES SLK cost to run?

⛽Fuel (Petrol, 2295cc)
£1,592
🏛️Road Tax
£250
🔧MOT Test
£55
🛠️Predicted Repairs
£500
Total per year£2,397
Per month£200/mo

Based on 7,400 miles/year (UK average), current fuel prices, and repair likelihood from MOT pass rate data. Insurance not included.

MERCEDES SLK by Year

YearPass RateTestsAvg Mileage
201689%2,57242,977 mi
201587%11,05548,710 mi
201487%11,28455,581 mi
201385%11,10662,322 mi
201284%13,36164,940 mi
201185%5,66061,469 mi
201080%4,47266,541 mi
200981%5,34771,532 mi
200880%6,87675,187 mi
200779%7,70077,695 mi
200679%7,88480,213 mi
200578%10,30582,791 mi
200478%6,59884,132 mi
200378%3,32785,438 mi
200281%3,69287,295 mi
200182%4,00590,848 mi
200079%3,54590,918 mi
199979%4,29587,626 mi
199879%3,52389,671 mi
199781%2,19090,802 mi
199676%12698,709 mi

Checking a specific MERCEDES SLK?

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About the 2004 MERCEDES SLK

The 2004 MERCEDES SLK is a large car with a 2295cc petrol engine. 6,598 of these vehicles were MOT tested in 2024, making it a reasonably common sight on UK roads. Among all cars from 2004, the average MOT pass rate is 72%, and this model beats that benchmark.

With an average of 84,132 miles at 20 years old, MERCEDES SLK owners tend to use this car less than the typical driver.

2004 MERCEDES SLK Fuel Costs

The 2295cc petrol engine offers a reasonable balance between performance and economy. Expect around 30 mpg in mixed driving, which works out to roughly £1,592 per year at current petrol prices of 142p per litre (based on 7,400 miles per year).

What does it cost to own a 2004 MERCEDES SLK?

Total estimated annual running cost is £2,397 (£200/month), broken down as £1592 fuel, £250 road tax, £55 MOT, and £500 predicted repairs. Repair costs are moderate, reflecting the 78% pass rate. Keeping on top of servicing will help avoid surprises.

MERCEDES SLK Reliability Trend

Newer MERCEDES SLKs show better MOT pass rates than older ones, with an average improvement of 4 percentage points.

Buying a Used 2004 MERCEDES SLK

At 20 years old, the MERCEDES SLK is firmly in budget territory. Purchase prices are low, but check for rust, worn suspension bushes, and electrical gremlins. A full service history is especially valuable at this age. If you're flexible on year, the 2016 model has the highest pass rate at 89%. With 6,598 MOT tests in our data, there's strong statistical confidence in these figures.

Alternatives to the 2004 MERCEDES SLK

If reliability is your priority, there's one similar car with a higher MOT pass rate. Here are comparable petrol cars with similar engines: