2012 Mercedes-Benz SLK 2.2L Diesel · TM04 MON

The most recent MOT test for this 2012 Mercedes-Benz SLK was conducted on 2025-09-05 and resulted in a passing outcome, marking the vehicle’s first clean test since the previous failure in 2025-09-04. The failure of the offside front coil spring in September 2025 indicates a critical structural component failure, which is not typical for a vehicle of this age and mileage. While the subsequent MOTs from 2024 onward have been entirely free of defects, the single major failure suggests either a pre-existing condition that accelerated wear or an incident that compromised the suspension system. The overall maintenance trend appears inconsistent, with a sudden and severe failure after years of passing tests, which raises concerns about underlying fatigue or manufacturing variability in the coil spring design. A thorough inspection of the remaining suspension components, particularly the offside rear suspension and any signs of fatigue in the front, would be prudent to assess long-term reliability. The recorded mileage of 26,650 miles for a vehicle aged approximately 14 years represents an unusually low annual usage rate of around 1,904 miles per year, which is significantly below the industry average for a car of this age. Such low mileage can stem from prolonged periods of inactivity, particularly if the vehicle has been stored in conditions that accelerate wear—such as prolonged exposure to extreme temperatures, humidity, or lack of fluid movement. However, the absence of higher mileage accumulation over the past decade suggests either deliberate low usage or a vehicle that has been kept in a stable, well-maintained state. The low mileage alone does not guarantee structural integrity, as standing vehicles can suffer from issues like brake disc corrosion, caliper binding, or fluid degradation due to stagnation. Additionally, the low usage profile may obscure wear patterns that would be more apparent under higher demand, so a comprehensive inspection is essential to identify any hidden wear or potential future issues. Given the recent MOT failure involving the offside front coil spring, the buyer should prioritise a detailed mechanical inspection of the suspension system. The fractured coil spring indicates that the vehicle’s front suspension geometry may be compromised, potentially leading to uneven tyre wear, excessive body roll, or handling instability. On a test drive, listen for abnormal clunking or rattling noises from the offside front suspension, particularly during cornering or over bumps, as these could signal further suspension component failure. Inspect the remaining coil springs, control arms, and bushings for signs of wear, cracking, or excessive play. Additionally, check for any misalignment or binding in the steering system, which could exacerbate handling issues. Immediate attention to the suspension is critical to prevent further damage to the vehicle’s structural integrity and to ensure safe operation. For the buyer, given the vehicle’s age and the low-mileage profile, a thorough physical inspection should also cover several critical areas beyond the suspension. Begin with the tyres, examining for sidewall perishing or cracking, which can occur even at low mileage due to prolonged exposure to UV light and oxygen. Check the tread depth and look for irregular wear patterns that may indicate misalignment or suspension issues. The brake system should be inspected for signs of corrosion on discs and linings, particularly if the vehicle has been stationary for extended periods, as this can lead to binding or reduced braking effectiveness. Verify the condition of the 12V battery, ensuring it holds a charge and has no signs of corrosion or physical damage, as low usage can accelerate battery degradation. Fluid levels—particularly the engine oil, brake fluid, and coolant—should be checked for contamination or degradation, with a recommendation to replace fluids that have sat unused for over 24 months, as they can become sludge or lose effectiveness. Finally, verify that service records are up to date, particularly for the timing belt (if applicable), as this component typically requires replacement every 60,000 to 100,000 miles or every 5 to 6 years, whichever comes first. If the vehicle has been stored, consider a professional assessment of the engine mounts and exhaust system for signs of fatigue or leaks, as these can develop silently over time.