2018 Mercedes-Benz X350 Power D 4MATIC Auto 3.0L Heavy oil · WM68 AAM

The latest DVSA MOT test for the 2018 Mercedes-Benz X-Class (X350) D 4MATIC AUTO was conducted on 2026-04-27 and resulted in a clean pass, with no recorded defects or advisories. The vehicle’s MOT history over the past five years is uniformly positive, showing consistent compliance with roadworthiness standards without any failures or advisories that might indicate a deterioration in mechanical integrity or recurring issues. This stability suggests that the owner has maintained a disciplined approach to vehicle upkeep, though the absence of detailed service records or fault codes does not preclude potential underlying wear that may not have triggered MOT failures. It is prudent for the buyer to treat this as a baseline of good practice, assuming the vehicle has been serviced in line with manufacturer recommendations, particularly given its high mileage. The recorded mileage of 142,718 miles is notably high for a vehicle of this age, averaging approximately 17,840 miles annually—a rate that exceeds typical expectations for a similarly aged model, which often accumulates around 10,000 to 12,000 miles per year. Such usage suggests either intensive operational demands, such as commercial or high-mileage personal use, or prolonged periods of inactivity followed by rapid accumulation. Mechanically, this elevated mileage places greater stress on consumables like brake pads, tyres, and suspension components, which may exhibit accelerated wear or signs of fatigue. The drivetrain, particularly the transmission and differential, could also show signs of wear, though without specific MOT advisories or service history, the extent of this wear remains speculative. The buyer should be particularly vigilant for symptoms such as uneven tyre wear patterns, reduced braking efficiency, or unusual suspension noises, which may indicate underlying issues that have not yet reached the threshold for MOT failure. Given the clean MOT history and the absence of any recorded defects, the buyer should conduct a thorough physical inspection to address potential age-related and mileage-induced concerns. First and foremost, examine the tyres for sidewall cracking or perishing, which can occur even with low mileage due to prolonged exposure to UV light and temperature fluctuations. Check for uneven wear, which may signal misalignment or suspension issues, and verify the tread depth is within legal limits. The vehicle’s 12-volt battery should be tested for capacity and corrosion on the terminals, as standing vehicles can suffer from battery degradation or sulphation, particularly in the UK’s variable climate. Additionally, inspect the brake system for signs of corrosion on discs and linings, or binding calipers, which can develop from prolonged idling or poor lubrication. The brake fluid reservoir should be checked for contamination or moisture buildup, as brake fluid degrades over time, even when not in use, and can compromise braking performance. The engine oil and coolant should be evaluated for their condition, with a focus on calendar-based servicing. Given the vehicle’s age, the oil may have degraded significantly if not changed within the recommended interval, which for many modern diesel engines is typically every 60,000 to 100,000 miles or annually, whichever comes first. A fresh oil change would mitigate risks of sludge formation, piston ring wear, and reduced fuel efficiency. The coolant should be checked for contamination or sludge, as standing fluids can corrode the water pump and radiator hoses over time. The exhaust system should be inspected for leaks or corrosion, particularly around the catalytic converter and mufflers, as these components can degrade with age and exposure to moisture. Finally, the suspension should be examined for signs of wear in bushes, coil springs, or control arms, which may exhibit excessive play or clunking when driving over bumps. A professional inspection, including a test drive to assess handling and listen for unusual noises, would be advisable to confirm the absence of hidden mechanical issues.