2021 Mercedes-Benz S-Class 2.9L Diesel · AL18 ADE

The latest MOT test conducted on 5 February 2026 resulted in a pass with no defects or advisories recorded. Reviewing the history back to January 2024, the vehicle has consistently passed its inspections without a single recorded fault. This indicates a highly stable maintenance trend, suggesting that the vehicle has been kept to a high standard and that any necessary wear-and-tear items have been addressed proactively before they could manifest as official defects. With a recorded mileage of 47,167 miles over approximately five years, the vehicle has averaged roughly 9,433 miles per year. This usage rate is considered typical for a luxury saloon of this calibre and represents a balanced duty cycle. Such a profile generally avoids the mechanical pitfalls associated with extreme high-mileage wear on the drivetrain and suspension, while also avoiding the risks of prolonged standing, such as perished seals or stagnant fluids. Because the MOT record is exceptionally clean, a prospective buyer should focus on age-related degradation and adherence to the manufacturer's service schedule. It is essential to scrutinise the tyre sidewalls for signs of perishing or micro-cracking, as high-performance tyres can degrade over time even if the tread depth remains well within legal limits. The service history book must be verified to ensure that oil and filter changes have been performed according to the required calendar intervals, as fluid degradation occurs regardless of the mileage covered. During a physical inspection and test drive, particular attention should be paid to the complex air suspension system. Listen for any excessive compressor noise and ensure the vehicle levels itself correctly without hesitation. Check the brake discs for uneven surface corrosion or evidence of binding calipers, which can occur if the vehicle has undergone periods of infrequent use. Finally, the health of the 12V auxiliary battery should be confirmed, as the extensive electronic suite in this model places significant demand on the electrical system, and a weakening battery can often trigger intermittent faults across the onboard diagnostics.