2015 Mercedes-Benz C 2.1L Diesel · CS11 AMS

The most recent MOT test result on 2025-10-01 shows the vehicle passed without any recorded defects, marking a positive turnaround from the previous year’s failures. While earlier MOTs reveal a pattern of recurring major issues—particularly front coil spring fractures in 2022 and 2021—this latest test indicates a significant improvement in roadworthiness, with no further mechanical failures or advisories linked to critical components. The absence of repeated major defects since 2023 suggests the vehicle has either undergone necessary repairs or that the underlying wear patterns have stabilised, though the oil leak advisory from 2024 remains a persistent concern that warrants ongoing attention. The advisory for the rear differential oil leak, though not excessive, indicates a potential long-term risk of increased wear or contamination if left unaddressed, which could compromise drivetrain integrity over time. The vehicle’s recorded mileage of 129,154 miles at 11 years old represents a moderate annual usage rate of approximately 11,741 miles per year, which is within the expected range for a car of this age and class. This usage profile suggests a mix of regular driving and periods of inactivity, which can accelerate wear in certain systems, particularly suspension components and brakes. The presence of multiple coil spring failures in prior MOTs—both front and rear—may imply either a design susceptibility to fatigue or underlying manufacturing inconsistencies, though the latest tests show no further fractures. The differential oil leak advisory could also reflect prolonged idling or infrequent servicing, as oil degradation and contamination are exacerbated by standing rather than active use. For a prospective buyer, the most critical areas to inspect are the rear differential oil leak and the front and rear suspension, as these have historically caused major concerns. Start by checking for oil contamination around the rear differential cover, as a persistent leak could lead to gearbox lubrication issues, causing increased wear or even failure of the differential itself. Listen for unusual clunking or rattling in the suspension during a test drive, particularly when driving over bumps or at low speeds, which may indicate worn suspension bushes, broken coil springs, or binding struts. Inspect the rear brakes for uneven wear or grinding noises, as the prior MOT failures highlighted significant brake pad and disc wear, which could worsen with continued use. Additionally, verify the front suspension for any signs of binding or excessive play in the struts or mounts, as the coil spring failures suggest potential long-term structural issues. Check the brake discs for corrosion or binding, especially on the offside rear, where prior advisories noted wear but no serious weakening. Inspect the tyres for sidewall perishing or cracking, which can occur even with moderate mileage if the vehicle has stood for extended periods, particularly in colder climates. Finally, ensure the 12V battery is in good condition, as prolonged inactivity can lead to corrosion or reduced capacity, and test the fluid levels in the cooling system and brake fluid reservoir, as these fluids degrade over time regardless of mileage. Given the vehicle’s age, a comprehensive service history check—particularly for suspension and drivetrain servicing—would be invaluable to confirm whether the oil leak and coil spring issues have been addressed.