2018 Mercedes-Benz C 2.1L Diesel · KV18 EOG

The most recent MOT test on 2026-07-07 resulted in a passing outcome, though it was accompanied by several persistent advisories that suggest a pattern of wear and potential underlying issues requiring attention. While the vehicle has not failed an MOT in the past two years, the recurring advisories—particularly the oil leak, tyre wear close to legal limits, and front brake disc pitting—indicate a maintenance trend that has not been fully resolved. The fact that the same defects were noted in both the failed test of 2024-05-02 and the subsequent passing tests of 2024-05-02 and 2025-06-25 suggests that while the vehicle may currently be roadworthy, the underlying causes of these issues—such as suspension or drivetrain wear, brake system degradation, or fluid system failures—demand proactive investigation. The consistent presence of these advisories, especially the oil leak and tyre wear, warrants further scrutiny to prevent escalation into major defects or safety concerns. The recorded mileage of 79,211 miles for a vehicle aged approximately eight years represents an annual usage rate of around 9,901 miles, which is within the expected range for a car of this make and model, particularly if it has been driven in mixed conditions. However, the lack of a significant gap between the 2024-05-02 and 2026-07-07 MOT tests suggests either consistent, heavy usage or periods of prolonged inactivity that may have contributed to wear patterns. The central rear prop shaft flexible coupling deterioration noted in 2024-05-02 could be exacerbated by high mileage, as this component is subject to torsional stress and fatigue over time. Additionally, the repeated tyre wear advisories, particularly the edge wear and deep cuts, may reflect improper alignment, excessive load distribution, or suspension issues that could worsen with continued use. The brake disc pitting is also a notable concern, as it can lead to reduced braking performance and increased heat generation, necessitating closer monitoring of brake system integrity. To proceed with a thorough inspection, the prospective buyer should prioritise checking the oil leak source, which could stem from a faulty oil seal, valve cover gasket, or engine component such as the camshaft or piston rings. During a test drive, listen for signs of oil consumption, such as a persistent smoke from the exhaust or a noticeable reduction in fuel efficiency, and inspect undercarriage areas for oil stains or wetness. The tyre wear advisories, particularly the edge wear and deep cuts, should prompt a visual inspection of tyre tread depth and sidewall condition, as well as a check for uneven wear patterns that may indicate misalignment or suspension issues. On the test drive, watch for steering pull, excessive vibration, or uneven tyre noise, which could signal misaligned wheels or worn suspension components like coil springs, shock absorbers, or suspension bushes. The front brake discs should be examined for even wear and signs of overheating, such as discolouration or warping, and listen for grinding noises when braking, which could indicate worn brake pads or binding calipers. For the brake system, the buyer should also verify that the brake fluid is clean and free of contaminants, as brake fluid degradation over time can lead to reduced braking effectiveness. Given the vehicle’s age and mileage, the brake master cylinder, calipers, and hydraulic lines should be inspected for signs of corrosion or fluid leakage, particularly if the vehicle has been stored for extended periods. The central rear prop shaft flexible coupling, which showed slight deterioration, should be assessed for excessive play or noise during acceleration and deceleration. If the coupling is confirmed to be failing, replacement may be necessary to prevent drivetrain issues or transmission damage. Additionally, the tyre advisories highlight the need for a full tyre inspection, including checking for sidewall damage, cracks, or signs of perishing, which can compromise tyre integrity and safety. For the front windscreen wiper blade, though not a major defect, a functional check should be performed to ensure it cleans the windscreen effectively, as a defective blade can impair visibility during adverse weather conditions. Lastly, given the vehicle’s age, a comprehensive fluid service—including engine oil, coolant, brake fluid, and transmission fluid—should be considered, as these fluids degrade over time and require replacement to maintain optimal performance and prevent long-term damage.