Mercedes Benz Slk (2015)
2015 Mercedes Benz Slk
CarHunch analysed 5,044 real MOT records for the 2015 Mercedes Benz Slk. This breakdown of actual test outcomes — pass rates, defect profiles, mileage data — isn't published anywhere else.
The 2015 Mercedes-Benz SLK performs better than the UK average at 88.3% first-time pass rate, though petrol versions (91.2%) are notably more reliable than diesels (87.2%). However, 35.3% of these cars have suffered a dangerous defect at some point—a serious concern that puts this model in genuinely risky territory for buyers.
With a median mileage of 37,299 miles for a nine-year-old car, these are relatively lightly used examples, yet they still average 1.15 failures and 6.8 advisories per MOT. Before buying, have a pre-purchase inspection focus on suspension, electrics, and brake components, as the high dangerous defect rate suggests structural or safety weaknesses specific to this generation rather than simple wear items.
Petrol vs Diesel
Pass rate difference of 4 percentage points — worth knowing if you're choosing between the two.
What to check before buying a 2015 Mercedes Benz Slk
Practical pre-purchase checks for this age and model.
- 📋 Check the full MOT history. Look for recurring advisories — slow-building issues like corrosion or brake wear patterns show up years before they become failures. Enter the reg below for a full AI analysis.
- 🔍 Inspect for corrosion in person. Brake pipes, sills, subframes, and chassis legs. Surface rust is normal at this age; structural rust is a serious problem that's expensive to fix and can fail an MOT.
- 🛞 Check tyres and brakes. The most common advisory items at this age. Budget for replacement if they're near the limit — factor this into your offer price.
- ⚠️ 35.3% of these vehicles have had a dangerous defect recorded. Enter the reg below — the full MOT history will show exactly what was flagged and whether it was resolved.
- 📄 Run an HPI check. The MOT history won't show outstanding finance, insurance write-offs, or stolen status — an HPI check will.
Before you buy a Mercedes Benz Slk
MOT history is one piece of the puzzle. These checks can reveal what CarHunch can't.
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Pass Rate by Fuel Type
| Fuel type | Vehicles | Pass rate | Avg failures |
|---|---|---|---|
| Diesel (70%) | 3,553 | 87.2% | 1.27 |
| Petrol (30%) | 1,491 | 91.2% | 0.84 |
Mileage Distribution
Most 2015 Mercedes Benz Slk vehicles sit in the blue band. If the car you're looking at is outside it, it's either unusually low or high mileage for its age.
Half of all 2015 Mercedes Benz Slk vehicles fall between 27,441 and 48,389 miles.
2015 Mercedes Benz Slk — Still on the Road
Strong survival — 4,657 vehicles still getting MOTs in 2025, 98% of the peak.
Based on vehicles from this manufacture year that had at least one MOT test in each calendar year. Data from 2018–2025.
MOT History Averages
Most Common MOT Issues — 2015 Mercedes Benz Slk
Based on actual MOT test records for this model. Percentage shows how often each item appears across all vehicles in this cohort.
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45.8%
Nearside Rear Tyre worn close to legal limit/worn on edge
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45.3%
Offside Rear Tyre worn close to legal limit/worn on edge
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24.4%
Offside Front Tyre worn close to legal limit/worn on edge
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21%
Nearside Front Tyre worn close to legal limit/worn on edge
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16.9%
Nearside Front Wheel bearing has slight play
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16.4%
Offside Front Tyre slightly damaged/cracking or perishing
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16.2%
Offside Front Wheel bearing has slight play
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15.7%
Nearside Front Tyre slightly damaged/cracking or perishing
Data covers a 3-year window centred on 2015. Counts include advisories and failures.
Found a specific Mercedes Benz Slk?
Enter the reg to see its individual MOT history, AI Hunches, and how it compares to this cohort.