2010 Mercedes B-Class 2.0L Diesel · KP60 NAE

Persistent oil seepage and a history of significant component failure define the mechanical profile of this Mercedes B-Class, which most recently secured a pass on 12 January 2023 with an ongoing advisory for an oil leak. While the vehicle has demonstrated the ability to clear the MOT testing process, the presence of an oil leak alongside a previous failure involving structural and safety-critical components suggests a pattern of wear that requires careful scrutiny. The transition from a major failure in early 2022 to a pass with advisories in 2023 highlights a vehicle that has required specific intervention to remain roadworthy, necessitating a thorough investigation into whether these issues have been permanently rectified or merely managed. Accumulating only 57,119 miles over sixteen years results in an average of approximately 3,570 miles per annum, a figure significantly below the national average for a vehicle of this vintage. This low-usage profile often introduces specific mechanical risks, as components that rely on regular movement to maintain seals and lubrication can suffer from stagnation. Extended periods of inactivity can lead to the hardening of rubber seals and the accumulation of internal oxidation, which may explain the recorded oil leak. Prospective buyers should be aware that low mileage does not equate to reduced wear on rubberised components or fluid-based systems, which may have aged due to time rather than distance covered. Focusing on the 2022 failure, the replacement of the offside front constant velocity boot is a critical area of concern. During your test drive, you must listen for clicking or knocking noises emanating from the front end while performing full-lock turns at low speeds, as this indicates potential long-term damage to the CV joint that may have occurred if the boot was split for an extended period. Furthermore, the persistent oil leak noted in the most recent test requires a physical inspection of the engine bay and the underside of the vehicle. You should look for fresh oil staining on the undertray or the subframe, as this will help determine if the leak is originating from a high-pressure seal or a more minor gasket weep that has been left unaddressed. Beyond these specific flagged items, the age of the vehicle necessitates a thorough check of the suspension and steering linkages, which often deteriorate on older, low-mileage models due to the natural degradation of rubber bushes. Pay close attention to any clunking or rattling sounds when traversing uneven road surfaces, as these are primary indicators of worn anti-roll bar links or control arm bushes. Additionally, ensure the steering feels precise with no excessive play or pulling to one side, as the front-end components were clearly subjected to enough stress to cause a tyre failure in the past. Verify that the braking system provides a firm pedal feel without judder, as the combination of age and low usage can lead to seized calipers or surface corrosion on the discs if the vehicle has sat idle for long stretches.