2015 Mercedes-Benz S-Class 3.0L Diesel · XS60 MON

The Mercedes-Benz S-Class in question presents a clean MOT history over the past decade, with the most recent test in April 2025 at 229,996 miles showing no defects—a consistent pattern confirmed by the three preceding passes in 2024 and 2022. The sole failure in May 2022, occurring at just 217,291 miles, stands out as an anomaly with no recorded issues, suggesting either a procedural error or an oversight in documentation. Given the absence of advisories or recurring faults across all tests, the vehicle’s roadworthiness trend appears stable, with no evidence of deteriorating mechanical or structural concerns. However, the lack of advisories does not preclude the need for a thorough pre-purchase inspection, particularly given the high mileage and luxury vehicle’s reliance on precision engineering. The mileage accumulation of roughly 20,909 miles per year is significantly above average for a vehicle of this age, indicating either sustained heavy use or prolonged periods of service without significant downtime. The gap between the 2021 test (189,118 miles) and the 2022 failure (217,291 miles) suggests a rapid increase in mileage—over 28,000 miles in less than a year—before the next test. While the subsequent tests in 2022, 2024, and 2025 show steady mileage increments, the absence of advisories or defects in high-wear areas like brakes, suspension, or emissions is unusual for a vehicle of this mileage and age. This could imply either meticulous maintenance by previous owners or, conversely, a history of deferred repairs that have yet to manifest in MOT results. For a prospective buyer, the primary focus should be on components prone to wear under high mileage: the suspension system, including coil springs, anti-roll bars, and bushings, which may exhibit fatigue or binding. The braking system—particularly the rear calipers, which are prone to binding in Mercedes S-Class models—should be inspected for uneven wear, corrosion, or fluid leaks, despite the clean MOT history. Structural integrity is another critical area; while the MOT records show no corrosion advisories, high-mileage luxury vehicles often develop hidden rust in wheel arches, sills, or underbody panels. Additionally, the exhaust system, emissions controls, and drivetrain components—such as the differential and transmission mounts—should be checked for excessive play, leaks, or abnormal wear, as these are less frequently flagged in standard MOT tests but can lead to costly failures. Given the vehicle’s age and mileage, a pre-purchase inspection by a Mercedes-Benz specialist is strongly advised to verify the absence of underlying issues not captured in the MOT. Pay particular attention to service records for evidence of regular maintenance, especially for items like timing belt replacement, fluid changes, and suspension component renewal. The clean MOT history is a positive indicator, but high-mileage luxury vehicles demand rigorous scrutiny to ensure no deferred repairs or hidden wear could compromise reliability.