2020 Mercedes-Benz C 300 AMG Line Edition DE Auto 1.9L Electric diesel · LS20 OWM

The latest MOT test on 2026-05-06 indicates the vehicle passed with several advisories, though no failures were recorded. While the overall maintenance trend appears stable, the presence of consistent advisories—particularly regarding tyre wear and the rear propeller shaft flexible coupling—suggests that the vehicle has experienced gradual wear progression over time, rather than a sudden deterioration. The prior failed MOT in 2024-08-12 for a non-functional windscreen washer, though rectified, highlights a minor but recurring issue that could be linked to either a persistent electrical fault or a less critical but noticeable oversight in routine checks. The lack of failures in the intervening clean MOTs suggests that the vehicle is generally roadworthy but requires attention to the listed advisories to prevent potential future issues. The recorded mileage of 93,407 miles for a 2020 model represents a high annual usage rate of approximately 15,568 miles per year, which is notably elevated for its age. Such mileage accumulation can accelerate wear on critical components such as suspension bushings, brake systems, drivetrain elements, and exhaust components, particularly the propeller shaft flexible coupling, which was flagged as slightly deteriorated in the latest MOT. The significant gap between the 2024-08-12 and 2025-05-16 MOTs—over six months without testing—could imply periods of either light usage or potential standing, which may have exacerbated internal corrosion or fluid degradation in components like brakes and the electrical system. The rapid mileage build-up suggests that the vehicle is subjected to higher stress, warranting a closer inspection of consumables and wear items. For the prospective buyer, the advisories on tyre wear—particularly the offside front and both rear tyres worn close to the legal limit—demand immediate attention. Tyres worn on the edges rather than centrally indicate improper alignment, excessive camber, or uneven load distribution, which can lead to further damage to the suspension or steering components. During a test drive, watch for signs of steering pull, uneven tyre wear patterns, or excessive road noise from the front or rear axles. The rear propeller shaft flexible coupling, marked as slightly deteriorated, should be inspected for excessive play, unusual noises (such as clunking or rattling during acceleration or cornering), or signs of fluid leakage from the coupling itself or adjacent seals. Given the high mileage, consider a thorough inspection of the drivetrain, including the universal joints and transmission mounts, for signs of wear or fatigue. Beyond the advisories, the vehicle’s age and usage profile necessitate a comprehensive physical inspection. Given the potential for standing corrosion, particularly in the brake system—where calipers may bind due to rust or fluid degradation—check for uneven brake pad thickness, excessive heat marks on discs, or a binding feel when applying the brakes. Inspect the brake fluid reservoir for contamination or low levels, as standing fluid can corrode the master cylinder and calipers over time. The windscreen washer system, though now functional, should be tested thoroughly to ensure all nozzles and hoses are clear of debris or leaks. Additionally, verify the condition of the 12V battery, as prolonged periods of disuse can lead to internal corrosion or reduced capacity, which may manifest as slow cranking or electrical system failures. Lastly, consider a fluid top-up check for the engine oil, coolant, and differential/transmission fluids, as these should be refreshed according to the manufacturer’s recommendations—typically every 60,000 to 100,000 miles or annually, depending on the vehicle’s usage. Tyre sidewall inspection for signs of perishing or cracking due to age is also critical, as this can compromise structural integrity and safety.