2015 Mercedes-Benz SLK 2.1L Diesel · ST51 ASK
2015 Mercedes-Benz SLK (2.1L, diesel). First registered 16/04/2015. Recorded mileage 123,982 miles. MOT valid until 18/08/2027. Taxed until 01/04/2027.
- Make & Model
- MERCEDES-BENZ SLK
- Year / Origin
- 2015 · Dundee
- MOT Status
- Valid until 18/08/2027
- Road Tax
- Taxed (01/04/2027)
- Recorded Mileage
- 123,982 mi
- ULEZ Compliance
- ULEZ Compliant (Euro 6 Diesel)
- Fuel & Engine
- Diesel · 2.1L
- Reliability Guide
- Common Faults
- Fuel Type
- Diesel
- Year
- 2015
- Engine
- 2143cc
ST51 ASK Key Findings
- 5 MOT tests recorded
- Latest MOT passed on 13/08/2026
- 123,982 miles recorded at latest MOT
- 1 historical MOT failure
- 1 defect noted at the latest MOT
- Recurring tyres items (4 mentions)
Derived directly from the recorded DVSA and DVLA data shown on this page.
MOT Roadworthiness: Average
This rating reflects historical MOT pass rates and recurring advisory wear patterns from official DVSA test logs. Note that roadworthiness does not verify outstanding finance, insurance write-offs, or stolen records.
Verify lender finance agreements, insurance write-offs, police stolen registers, and mileage rollback.
Digital Service History
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ST51 ASK Mileage History
- 18/07/2023104,730 mi
- 23/07/2024111,360 mi+6,630 mi
- 19/08/2025118,511 mi+7,151 mi
- 20/08/2025118,515 mi+4 mi
- 13/08/2026123,982 mi+5,467 mi
Average of roughly 6,268 miles per year across 5 recorded odometer readings.
ST51 ASK MOT History
Interpretation generated from the recorded test data above — not an official DVSA statement and not a substitute for an independent inspection.
5 MOT tests are recorded for this 2015 Mercedes-Benz Slk (ST51 ASK) between July 2023 and August 2026.
The record contains 4 passes and 1 failure.
The most recent test on 13 August 2026 was a pass, although the earlier record includes 1 failure that buyers may want to investigate.
Across all tests, the most frequently flagged areas are: Tyres (4 issues), Brakes (3 issues), Windscreen (1 issue). Repeated mentions in one area can indicate an ongoing pattern worth checking in person.
In total 4 advisory notices are recorded. Advisories flag items that passed but may need attention before the next test; they are not evidence of how well the vehicle has been serviced.
Recorded failure items include: “Central Front Tyre has ply or cords exposed (5.2.3 (d) (ii))”; “Engine MIL inoperative or indicates a malfunction (8.2.2.2 (g))”; “Windscreen washer provides insufficient washer liquid (3.5 (a))”.
Buyer's Guide & Inspection Advisory
Expert automotive synthesis from historical MOT defect records and market benchmarks.
Our Verdict
Proceed with caution and thorough inspection. While it is a premium diesel roadster, the recent MOT failure for an inoperative engine warning light and multiple dangerous tyre defects suggests a period of deferred maintenance.
Your primary focus should be the engine's health. The August 2025 MOT failure noted a 'Major' fault regarding an inoperative or malfunctioning Engine MIL (Malfunction Indicator Lamp). You must demand proof that this fault has been professionally diagnosed and rectified, as an engine warning light can mask serious issues with emissions or fuel systems.
Secondly, look closely at the service history. The recent 'Dangerous' tyre failures and 'Major' washer fluid issue suggest the previous owner may have been cutting corners on basic maintenance. Ensure the service intervals have been strictly followed, especially given the high mileage of 118,515 miles, and check if the recent brake disc advisory has been addressed since the last test.
As a 2.1L diesel, this SLK should offer better fuel economy than its petrol counterparts, making it a more economical choice for longer motorway cruises. However, being a premium Mercedes-Benz, maintenance costs will be higher than a standard hatchback, particularly for specialist parts like the retractable hardtop components or diesel particulate filters.
Expect moderate insurance groups and typical diesel tax bands for a 2015 vehicle. Annual running costs, including fuel, tax, insurance, and a budget for upcoming maintenance (like the noted brake discs), are estimated to be in the mid-to-high range for a roadster.
Start with the tyres. The 2025 MOT history recorded 'Dangerous' defects with cords exposed on the central front tyre and tread below 1.6mm on the rear. Ensure all four tyres are brand new and of a reputable brand, not just 'legal' budget replacements.
Next, inspect the braking system. The most recent advisory noted that the front brake discs are worn, pitted, or scored. Check that these have been replaced and not just cleaned. Finally, test the engine warning light functionality by cycling the ignition to ensure the dashboard displays all correct warnings, and verify that the windscreen washer system is fully operational, as this was a previous MOT failure point.
This 2015 Mercedes-Benz SLK is a high-mileage diesel example, having covered 118,515 miles by July 2026. While it has a history of passing MOTs, the most recent test in August 2025 showed significant neglect regarding tyre safety and a major engine warning light issue. The vehicle offers a premium driving experience but requires immediate attention to its braking and tyre components.
No aggregate reliability data is available for this specific model to provide a comparative benchmark.
Reviewed by the IsItAGoodCar editorial team — Verified automotive analysis synthesized from official vehicle registries.
Data Sources
DVSA
Official MOT test logs & failure reasons
DVLA
Tax, registration & powertrain specs
Experian
Finance, stolen markers & total loss
AI Analysis
Historical fault & advisory patterns
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