2005 Mercedes S-Class 3.2L Diesel · P3 ADT

The most recent MOT test on 26 May 2026—just two months ago—confirms the vehicle remains roadworthy but with two persistent suspension issues that have not been resolved. The tester flagged slight play in both front lower suspension arm ball joints, a condition that has been documented since the May 2026 test at 131,320 miles. While the oil leak noted at that time was classified as minor, it suggests potential wear in the valve cover or cylinder head gasket area, requiring closer observation for any escalation. The absence of major defects in prior tests (2024, 2023, and 2022) indicates these faults are recent developments rather than a long-standing pattern of neglect. However, the recurrence of suspension play raises concerns about alignment stability and potential accelerated wear to tyres or steering components. The mileage progression over the past four years shows a steady accumulation of approximately 2,000–4,000 miles annually, averaging around 3,000 miles per year since the 2022 test at 119,337 miles. This rate is consistent with typical usage for a vehicle of this age, though the gap between tests—nearly 12 months between 2024 and 2026—is slightly longer than the standard 12-month MOT interval. There are no red flags in the data suggesting prolonged periods of disuse or rapid mileage spikes, but the lack of intermediate servicing records means critical maintenance intervals (e.g., timing belt, fuel filter, or differential fluid changes) cannot be verified. The recorded mileage of 131,320 miles aligns with the vehicle’s age, though the absence of service history beyond MOTs complicates an assessment of internal component wear. A buyer should prioritise an immediate inspection of the front suspension components, particularly the ball joints and associated mountings, as the documented play indicates compromised structural integrity. The slight oil leak warrants a closer examination of the cylinder head gasket or valve cover seals, as prolonged leakage could lead to contamination or reduced engine efficiency. Given the vehicle’s age and mileage, the condition of the exhaust system—especially for corrosion or leaks—should be thoroughly checked, alongside the brake calipers and discs for uneven wear or binding. The absence of defects in prior MOTs does not preclude underlying issues in less accessible areas, such as the drivetrain, transmission, or electrical systems, which are not routinely tested. Independent verification of fluid levels (brake, coolant, differential) and a test drive to assess suspension responsiveness and brake performance are essential.