2015 Mercedes-Benz S-Class 3.0L Diesel · RU04 AYY

The most recent MOT test, conducted on 2026-05-16, confirms the vehicle passed without any recorded defects or advisories, maintaining a clean test history over the past two years. The consistent passing of MOTs from 2021 through 2026 suggests a stable maintenance regime and no evidence of deteriorating structural or mechanical integrity. However, the absence of advisories or failures does not guarantee long-term reliability without further scrutiny, as wear patterns and potential hidden issues may not surface until more advanced deterioration occurs. Given the vehicle’s age and the lack of prior failures, the owner should prioritise a thorough pre-purchase inspection to identify any latent issues that might not be flagged during routine MOT testing, such as subtle suspension wear or fluid degradation that could become critical over time. The recorded mileage of 70,828 miles for a vehicle aged approximately 11 years represents a moderate annual usage rate of around 6,439 miles per annum, which is within the expected range for a car of this class. This usage profile indicates a balanced but not particularly aggressive driving pattern, which is preferable for preserving components like brakes, tyres, and suspension. However, the absence of recent high-mileage spikes does not preclude the possibility of prolonged periods of inactivity, which can exacerbate issues such as standing corrosion on brake components, fluid stagnation in the cooling and hydraulic systems, or tyre sidewall degradation from exposure to environmental elements. A buyer should be particularly vigilant about any signs of uneven tyre wear or potential fluid leaks, as these could signal underlying mechanical or maintenance neglect. Given the clean MOT history and the vehicle’s age and mileage, the most critical checks for a prospective buyer should focus on identifying signs of wear progression that may not be apparent during an MOT but could become problematic over time. Begin by inspecting the tyres for sidewall cracking or perishing, which can occur even with moderate mileage due to prolonged exposure to UV radiation and temperature fluctuations. Verify the condition of the 12V battery and associated electrical systems, as older vehicles are more susceptible to battery failure or corrosion in the battery terminals, especially if the car has been stationary for extended periods. Next, examine the brake system for signs of corrosion on the discs, particularly on the inner surfaces where moisture can accumulate, or check for binding calipers that may indicate hydraulic fluid degradation or seized components. During a test drive, listen for any unusual noises such as clunking from the suspension, which could signal worn suspension bushes or damaged coil springs, or a grinding sound from the brakes, which might indicate worn brake pads or damaged brake discs. Pay close attention to the steering feel, as excessive play or vibration could point to internal suspension wear or misaligned wheels. Additionally, check for any fluid leaks under the vehicle, particularly from the engine bay, transmission area, and under the bonnet, as these could indicate failing seals or fluid loss that would compromise engine or drivetrain performance. Finally, consider verifying the service history for time-based maintenance such as oil changes, coolant system servicing, and suspension component replacements, as these are essential for maintaining the vehicle’s long-term reliability. If any of these checks reveal concerns, further diagnostic work or professional inspection may be warranted before finalising the purchase.