2015 Mercedes-Benz A-Class 1.5L Diesel · AF65 AYB

The most recent MOT inspection on 12 May 2025 resulted in a pass, but the technical history reveals a concerning trend regarding safety systems and fluid integrity. While the vehicle has passed its recent tests, the presence of a new advisory regarding the supplementary restraint system warning lamp failing to illuminate is a significant safety concern that requires immediate attention. This indicates a fault within the airbag or seatbelt pretensioner monitoring circuit, which may render the vehicle's safety systems inoperative during an accident. The overall maintenance profile suggests a reactive rather than proactive approach, as evidenced by the recurring oil leak advisories and the previous dangerous failure involving critically worn rear brake pads. With 165,366 miles recorded over approximately eleven years, this Mercedes-Benz A-Class has averaged roughly 15,000 miles per year. This is considered high mileage for a premium hatchback of this age, placing considerable mechanical stress on the drivetrain, suspension, and braking components. High annual mileage typically implies more frequent engine operation, which can lead to accelerated wear on seals, gaskets, and timing components. Given the recorded mileage and the specific history of oil leaks, the engine has likely undergone significant thermal cycling and mechanical load, making the integrity of the lubrication system a primary concern for any prospective owner. The recurring advisory for an oil leak, which has been noted consistently since at least 2023, suggests a persistent issue such as a weeping valve cover gasket, oil filter housing seal, or sump gasket. You must inspect the engine bay and the underside of the vehicle for active dripping or heavy oil staining. During a test drive, listen for any rhythmic tapping or knocking sounds that could indicate oil starvation or internal component wear. Furthermore, the recent failure of the nearside rear brake pads to a dangerous level, combined with previous advisories for thinning pads and worn tyres, indicates that the braking system and tyre management have been neglected. You should check the current thickness of all brake pads and inspect the brake discs for deep scoring or excessive lip formation, which often accompanies neglected pad changes. Beyond the recorded defects, the high mileage necessitates a rigorous inspection of the suspension and steering geometry. Pay close attention to the anti-roll bar linkages and suspension bushes, as the previous failure of the nearside front anti-roll bar linkage suggests these components are prone to wear on this specific vehicle. During the test drive, listen for any clunks, knocks, or knocks when traversing uneven surfaces or turning the steering wheel, which would indicate worn ball joints or bushings. Additionally, given the age and mileage, verify that the service history supports regular oil and filter changes, as the documented oil leak could lead to long-term engine degradation if not strictly monitored. Check the condition of all coolant hoses and drive belts for perishing or cracking, as high-mileage vehicles often suffer from rubber component fatigue.