2009 Mercedes C 6.2L Petrol · NJ59 KWL

The most recent MOT test on 2025-10-31 resulted in a passing outcome, but the vehicle’s MOT history reveals a pattern of recurring issues rather than consistent stability. While the tests from 2023 to 2024 were clean, the failure on 2025-10-29—marked by two dangerous failures related to tyre tread depth and a major defect for a non-functional front windscreen washer—indicates that the vehicle has not been fully maintained to current standards. The advisory of offside rear service brake binding, though not severe, suggests a persistent mechanical concern that could escalate if ignored, particularly given its age and the potential for progressive wear in the brake system. The fact that this advisory reappeared in both the failed and passed tests underscores the need for closer attention to brake component condition, as binding can lead to uneven wear, reduced braking efficiency, or even failure under load. The recorded mileage of 81,430 miles for a vehicle aged 17 years represents a notably low annual usage rate of approximately 4,790 miles per year, which is unusually low for a car of this age. Such low mileage can result from prolonged periods of inactivity, particularly if the vehicle has been stored in a garage or kept in a non-operational state. However, this usage profile does not necessarily mitigate the risks associated with age alone, as standing vehicles are prone to issues such as corrosion in brake components, standing corrosion in the exhaust system, and degradation of fluids that have not been refreshed. The potential for fluid degradation—especially in the brake hydraulic system, which was noted to be close to minimum levels in the 2025-10-29 MOT—is a critical concern, as brake fluid absorbs moisture over time, reducing its effectiveness and risking hydraulic failure. Additionally, the tyre tread depths, while now failing the legal minimum, may have been deeper when the vehicle was last used, meaning the wear could have been accelerated by prolonged standing or improper storage conditions. As a prospective buyer, the most urgent actions should focus on addressing the tyre tread depth failure, which is a dangerous defect and must be rectified immediately. Replace both rear tyres to meet the legal 1.6mm minimum tread depth, as under-inflated or worn tyres compromise traction, hydroplaning risk, and overall road safety. The offside rear brake binding advisory warrants thorough inspection, particularly of the rear brake calipers, pads, and hydraulic system. Listen for a grinding or squeaking noise when applying the brakes, especially on the offside rear, and check for uneven pad wear or binding calipers that may require adjustment or replacement. During a test drive, monitor the braking performance for any signs of sponginess, pulling to one side, or reduced stopping distance, as these could indicate hydraulic issues or master cylinder problems. Beyond immediate concerns, conduct a comprehensive physical inspection of the vehicle’s structural and fluid-related components. Given the low annual mileage, check for signs of standing corrosion, particularly around the exhaust system, brake components, and undercarriage, as moisture and lack of movement accelerate rust formation. Inspect the brake hydraulic reservoir for any signs of contamination or leaks, and consider replacing the brake fluid if it has been more than two years old, as it may have degraded in quality. Verify the condition of the front windscreen washer system, ensuring the reservoir is full and the nozzle is clear of obstructions, as this was a major failure in the last MOT. Additionally, examine the tyre sidewalls for signs of perishing or cracking, which can indicate age-related degradation even if the tread remains legal. Finally, test the 12V battery and alternator to ensure they are functioning correctly, as low usage can lead to battery drain or alternator failure, particularly if the vehicle has been stored for extended periods. Schedule a professional inspection within the next 1000 miles or six months, whichever comes first, to address the remaining advisories and ensure the vehicle remains roadworthy and safe for continued use.