MERCEDES SLK (2015)
Running costs, common problems, and reliability data based on 11,055 real MOT tests in 2024.
MOT Pass Rate
87%
Total Tests (2024)
11,055
Avg Mileage
48,710 mi
Est. Annual Cost
£2,247
Is the 2015 MERCEDES SLK reliable?
Good reliability. Occasional issues but generally solid. That's close to the national average of 82%.
At 9 years old, 87% of MERCEDES SLKs from 2015 passed their MOT first time in 2024. That's based on 11,055 tests across the UK. The average mileage at this age is 48,710 miles.
How does the 2015 MERCEDES SLK compare?
Mileage Analysis
The average 2015 MERCEDES SLK has 48,710 miles on the clock, which is below the expected 66,600 miles for a 9-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 2015 sits between the two at 87%.
How much does a 2015 MERCEDES SLK cost to run?
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
| Year | Pass Rate | Tests | Avg Mileage |
|---|---|---|---|
| 2016 | 89% | 2,572 | 42,977 mi |
| 2015 | 87% | 11,055 | 48,710 mi |
| 2014 | 87% | 11,284 | 55,581 mi |
| 2013 | 85% | 11,106 | 62,322 mi |
| 2012 | 84% | 13,361 | 64,940 mi |
| 2011 | 85% | 5,660 | 61,469 mi |
| 2010 | 80% | 4,472 | 66,541 mi |
| 2009 | 81% | 5,347 | 71,532 mi |
| 2008 | 80% | 6,876 | 75,187 mi |
| 2007 | 79% | 7,700 | 77,695 mi |
| 2006 | 79% | 7,884 | 80,213 mi |
| 2005 | 78% | 10,305 | 82,791 mi |
| 2004 | 78% | 6,598 | 84,132 mi |
| 2003 | 78% | 3,327 | 85,438 mi |
| 2002 | 81% | 3,692 | 87,295 mi |
| 2001 | 82% | 4,005 | 90,848 mi |
| 2000 | 79% | 3,545 | 90,918 mi |
| 1999 | 79% | 4,295 | 87,626 mi |
| 1998 | 79% | 3,523 | 89,671 mi |
| 1997 | 81% | 2,190 | 90,802 mi |
| 1996 | 76% | 126 | 98,709 mi |
Checking a specific MERCEDES SLK?
Enter the reg plate to see its individual MOT history, mileage verification, and predicted costs.
About the 2015 MERCEDES SLK
The 2015 MERCEDES SLK is a performance with a 5461cc petrol engine. 11,055 of these vehicles were MOT tested in 2024, making it one of the most commonly tested cars on UK roads. Among all cars from 2015, the average MOT pass rate is 83%, and this model beats that benchmark.
With an average of 48,710 miles at 9 years old, MERCEDES SLK owners tend to use this car less than the typical driver.
2015 MERCEDES SLK Fuel Costs
The 5461cc petrol engine is on the larger side, so fuel won't be this car's strong point. 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 2015 MERCEDES SLK?
Total estimated annual running cost is £2,247 (£187/month), broken down as £1592 fuel, £250 road tax, £55 MOT, and £350 predicted repairs. Repair costs are moderate, reflecting the 87% 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 2015 MERCEDES SLK
At 9 years old, this is a solid used buy if you find one with good service history. Depreciation has levelled off, so you won't lose much more value. Focus on condition over mileage. If you're flexible on year, the 2016 model has the highest pass rate at 89%. With 11,055 MOT tests in our data, there's strong statistical confidence in these figures.
Alternatives to the 2015 MERCEDES SLK
If reliability is your priority, there are 4 similar cars with a higher MOT pass rate. Here are comparable petrol cars with similar engines:
- LAND ROVER RANGE ROVER (2017) 91% pass rate (+4%) from 16,007 tests
- MERCEDES S-CLASS (2017) 93% pass rate (+6%) from 5,990 tests
- JAGUAR F-TYPE (2014) 94% pass rate (+7%) from 5,734 tests
- JAGUAR XK (2014) 93% pass rate (+6%) from 2,618 tests