2004 Mercedes-Benz SLK 3.5L Petrol · M30 UNN
2004 Mercedes-Benz SLK (3.5L, petrol). First registered 03 Sept 2004. Recorded mileage 62,728 miles. MOT expired on 04 Oct 2026.
- Make & Model
- MERCEDES-BENZ SLK
- Year / Origin
- 2004 · Manchester
- Safety Recall
- Unknown
- MOT Status
- Expired on 04 Oct 2026
- Road Tax
- —
- Recorded Mileage
- 62,728 mi
- ULEZ Compliance
- Check Required (Pre-Euro 4 Petrol)
- Fuel & Engine
- Petrol · 3.5L
- Reliability Guide
- Common Faults
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M30 UNN Key Findings
- 4 MOT tests recorded
- Latest MOT passed on 09/09/2025
- 62,728 miles recorded at latest MOT
- No defects recorded at the latest MOT
Derived directly from the recorded DVSA and DVLA data shown on this page.
M30 UNN MOT History
Interpretation generated from the recorded test data above — not an official DVSA statement and not a substitute for an independent inspection.
4 MOT tests are recorded for this 2004 Mercedes-Benz Slk (M30 UNN) between October 2022 and September 2025.
The record contains 4 passes and 0 failures.
No failures or advisories appear anywhere in the recorded tests, so the documented MOT record is relatively clean.
M30 UNN Mileage History
- 05/10/202260,149 mi
- 05/10/202361,040 mi+891 mi
- 09/09/202461,686 mi+646 mi
- 09/09/202562,728 mi+1,042 mi
Average of roughly 880 miles per year across 4 recorded odometer readings.
Technical Specifications
Core Specifications
Identification & Status
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Known faults for Mercedes-Benz Mercedes-Benz SLK (R171)
Our database tracks 6 specific mechanical faults and recurring failure patterns identified across UK MOT testing stations for this generation.
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.
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MERCEDES-BENZ SLK Model Intelligence & Reliability
Verified MOT failure trends, buying advice, and technical directory specifications.
Owner-reported defects, recurring MOT failure points, and estimated repair costs.
Browse production generations, registration statistics, and trim variants.
Historical MOT pass rates and DVLA records for 2004 model year cars.
- M272 V6 Balance Shaft WearSerious
Early 3.0L and 3.5L V6 engines used soft metal gears on the balance shaft. The gears wear down, altering engine timing and requiring a massive engine-out repair.
- Vario-Roof Hydraulic LeaksModerate
The complex folding hardtop uses multiple hydraulic cylinders that can leak as the seals age.
- Rear Subframe Corrosion and PerforationSerious
The pressed-steel multi-link rear subframe on the R171 SLK is highly prone to severe internal corrosion, aggravated by decades of wet UK winter roads and road salt. Moisture and grime accumulate inside the hollow box sections, rusting the subframe from the inside out until structural perforation occurs around the suspension control arm mounting points. In severe cases, an arm mount shears off entirely, causing sudden dangerous rear-wheel steering and an immediate MOT failure. Mercedes-Benz UK has historically assessed replacements under goodwill on a case-by-case basis.
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