2010 Mercedes ML450 Sport CDI Auto 4.0L Diesel · 4 RT

The latest MOT test for this 2010 Mercedes-Benz ML450 Sport CDI occurred on 2025-10-07, where it passed without any defects, following a previous failure on 2024-03-02 that included critical faults such as non-functional front direction indicators and mirror indicators, alongside persistent advisories related to brake system corrosion and wear. While the vehicle has demonstrated stability in recent MOT results—with only minor issues recorded in the last two tests—this pattern suggests a recurring problem area, particularly with the braking and electrical systems. The advisories from 2023-02-17 and 2024-03-02 indicate ongoing wear and potential corrosion that have not been fully addressed, which could escalate if left unattended. The fact that the vehicle passed in October 2025 implies that any underlying issues have either been mitigated or are not yet severe enough to fail the test, but the history warrants cautious optimism rather than complacency. The vehicle’s recorded mileage of 179,207 miles at the time of this assessment aligns with a typical annual usage rate of around 11,200 miles, which is moderate for a 16-year-old diesel-powered SUV of this class. Given the age and mileage, the vehicle has likely accumulated wear on consumables such as brake pads, seals, and suspension components, but the consistent mileage suggests a steady, if not aggressive, driving regime rather than prolonged idling or infrequent use. The absence of significant mileage gaps—such as those indicative of long periods of disuse—also reduces the risk of standing corrosion or fluid degradation from stagnation. However, the high mileage does mean that wear on critical systems like brakes, drivetrain, and exhaust components is more pronounced, necessitating a thorough inspection to confirm that the advisories from past MOTs have been resolved or are manageable. For the prospective buyer, the most critical areas to inspect are the braking system and electrical components, given the recurring advisories and previous failures. Begin with a visual and hands-on examination of the brake system: check for uneven wear on the rear brake pads, which the advisories from 2024-03-02 indicate are already thin. Listen for a grinding noise when applying the brakes, which could signal metal-to-metal contact if pads are severely worn or warped. Inspect the brake hoses and pipes for any signs of corrosion, particularly around the rear brakes, where the advisories mention grease or debris accumulation. The handbrake cable on the offside rear should be checked for flexibility and corrosion, as the 2024-03-02 failure noted damage to this component. During a test drive, note any soft or spongy pedal feel, which may indicate brake fluid contamination or air in the system, or excessive stopping distances, which could signal worn discs or master cylinder issues. In addition to the braking system, the electrical faults from the 2024-03-02 MOT failure—particularly the non-functional front direction indicators and mirror indicators—must be addressed promptly. Test the operation of all exterior lights, including the direction indicators, hazard lights, and running lights, to ensure they respond reliably. The direction indicators should flash at a consistent rate, and the mirrors should be free of binding or corrosion that could affect visibility or functionality. For the electrical system, check the battery terminals for corrosion or loose connections, which could exacerbate issues with the indicators and mirrors. Given the vehicle’s age and mileage, it is also prudent to verify the condition of the 12V battery and alternator, as a failing alternator could lead to electrical gremlins and further failures. Beyond the electrical and braking systems, the advisories of tyre cracking or perishing on the rear tyres from 2023-02-17 highlight the need to inspect the tyres for any signs of sidewall damage or tread depth wear, as these can compromise road grip and safety. Finally, consider a comprehensive fluid check, including brake fluid, coolant, and transmission fluid, as these fluids degrade over time and can lead to catastrophic failures if not replaced at the recommended intervals. For a vehicle of this age and mileage, a thorough service history review—particularly for brake servicing, electrical diagnostics, and fluid replacements—should be a priority to confirm that all advisories have been resolved and prevent future roadside failures.