1996 Mercedes 609D 4.0L Diesel · P166 MGS

The most recent MOT test for this 1996 Mercedes 609D was conducted on 2024-06-11, resulting in a pass with a single advisory regarding a slight exhaust leak. However, the vehicle’s MOT history reveals a pattern of recurring issues rather than a consistent improvement. The 2024 test followed a 2023 failure marked by major defects such as power steering malfunction, a deteriorated track rod end ball joint, and headlamp aim problems, alongside minor issues with indicator controls. The 2021 failures—particularly the binding service brakes and inoperative parking brake—highlight persistent mechanical concerns that have not been fully resolved, suggesting either ongoing wear or unresolved prior repairs. While the 2022 and 2021 tests show some minor improvements, the 2024 advisory of an exhaust leak and the 2024 failure’s critical offside brake pipe risk indicate that the vehicle’s structural and mechanical integrity remains vulnerable to further deterioration if not addressed promptly. The recorded mileage of 170,814 miles for a vehicle aged approximately 30 years represents a notably low annual usage rate of around 5,694 miles per year, which is unusually low for its age. Such low mileage could imply the car has been stored for extended periods, particularly given the significant gaps between MOT tests—such as the 18-month interval between 2021 and 2023. While low mileage may suggest reduced wear on consumables like oil, brake pads, and tyres, it does not absolve the vehicle from potential issues arising from prolonged static conditions. Standing vehicles are particularly susceptible to corrosion in brake systems, suspension components, and the battery, as well as fluid degradation from lack of circulation. The brake failures from 2021—including excessive binding and inoperative parking brake—are particularly concerning; standing for long periods can cause brake discs to corrode, calipers to bind, or hydraulic lines to dry out, leading to reduced braking performance or failure. Before proceeding with purchase, the prospective buyer should conduct a thorough physical inspection and test drive to identify any latent issues exacerbated by low mileage or prolonged storage. Focus on the brake system: check for corrosion on brake discs and linings, listen for grinding or binding when applying the brakes, and verify that the parking brake engages smoothly and holds the vehicle securely when engaged. Inspect the suspension for signs of rust or excessive play in the struts, coil springs, and control arms, as standing can accelerate corrosion in these components. The exhaust system should be examined for leaks, particularly around the flexible connections, as the 2024 advisory suggests ongoing wear. Additionally, the battery should be tested for charge and terminals, as prolonged disuse can lead to sulfation or corrosion. Tyres should be checked for sidewall cracking or perishing, which can occur even at low mileage due to age-related degradation, and ensure tread depth meets legal requirements. For fluid servicing, the buyer should prioritise checking the brake fluid, coolant, and power steering fluid for contamination or degradation, as these can deteriorate over time even with minimal use. The 2023 failure highlighted a power steering malfunction, so verifying the fluid level and condition is critical. The vehicle’s service history should be reviewed for any scheduled fluid changes or component replacements, particularly for the brake system and suspension, which may have been deferred due to low usage. If the car has been stored, consider a professional inspection to assess the condition of the electrical system, as indicator and lamp failures have recurred. Finally, given the brake-related failures, it is advisable to have the vehicle’s braking system professionally serviced before use, ensuring all components are free from corrosion and binding, and that the hydraulic system is fully operational.