2011 Mercedes-Benz CLS 3.0L Diesel · FN11 LVR

The most recent MOT test for this 2011 Mercedes-Benz CLS was conducted on 2025-11-26 and passed without any recorded defects, marking a positive turnaround after a series of failures and advisories in the preceding years. While the vehicle’s 2024-11-20 MOT showed a dangerous failure for excessively binding rear service brakes and a nearside rear tyre with insufficient tread, the subsequent tests from 2023 onward were clean, indicating either corrective action taken or a stabilisation of underlying issues. However, the 2021-11-23 failure—particularly the fractured rear coil spring and rusted rear level rod—suggests persistent wear in the suspension system, which may have been overlooked or deferred in earlier tests. The trend suggests a period of maintenance intervention followed by relative stability, but the history reveals critical wear patterns that require careful attention. The vehicle’s recorded mileage of 114,147 miles over roughly 15 years represents an average annual usage of around 7,610 miles, which is consistent with typical light-to-moderate use for its age. This rate does not indicate excessive wear on consumables like fluids or filters, but it does imply prolonged periods of inactivity or light operation, which can accelerate corrosion in standing components. For instance, standing brake discs or calipers may develop corrosion or binding due to prolonged idling, and suspension bushes could degrade faster when the vehicle is not regularly driven. Additionally, the presence of sidewall cracks and cuts in the tyres, particularly on the near-side front outer tyre, suggests either long-term storage without rotation or uneven loading, which could lead to further tyre degradation if not addressed. Given the MOT history, the buyer should prioritise a thorough inspection of the suspension system, focusing on the rear coil spring and level rod components. On a test drive, listen for unusual clunks or rattles in the rear suspension, particularly when the vehicle is driven over bumps or at higher speeds, as these could indicate loose or worn suspension bushes or binding level rods. The excessively binding rear service brake from the 2024 MOT failure is particularly critical; inspect the brake system for uneven wear on the rear discs or pads, and check for any binding or grinding noises when the brake pedal is applied. If the brake pedal feels spongy or requires excessive force, this could signal air in the hydraulic system or a failing master cylinder. Additionally, verify the rear brake discs for corrosion or excessive pitting, as these can compromise braking performance and safety. For the tyre advisories, the near-side front outer tyre with sidewall cracks or perishing is a red flag for potential structural weakness, especially if the cracks are deep or spreading. Replace this tyre immediately, as sidewall damage can lead to sudden blowouts. The near-side rear tyre with insufficient tread should be replaced as soon as possible to meet legal requirements and ensure safe traction, particularly in wet conditions. Beyond tyres, check the front and rear tyres for uneven wear patterns, which could indicate misalignment, suspension issues, or incorrect tyre pressure. For the age and mileage of this vehicle, consider a visual inspection of the engine bay for signs of fluid degradation, such as oil or coolant leaks, and ensure all fluids—brake fluid, coolant, and transmission fluid—are topped up and free from contaminants. Finally, test the 12V battery and starter system, as prolonged inactivity can lead to battery failure or electrical gremlins, which are common in older vehicles. A simple battery voltage check and listening for clicking noises when starting the engine are essential preliminary steps.