2018 Mercedes-Benz S-Class 2.9L Diesel · LM68 ABK

The most recent MOT test on the 2018 Mercedes-Benz S-Class, conducted on 2026-04-29, resulted in a clean pass with no recorded defects or advisories. Over the past five years, the vehicle has consistently achieved passing grades without any failures, indicating a stable maintenance history and adherence to regulatory standards. This consistency suggests that the owner has likely followed a disciplined approach to servicing, though the absence of detailed service records or advisories means that wear progression on high-mileage components—such as suspension, drivetrain, and braking systems—remains unquantified by the DVSA. The lack of prior failures also implies that any underlying issues, if present, have either been addressed promptly or are still in early stages of development. The recorded mileage of 163,995 miles for a vehicle aged eight years represents a high annual usage rate of approximately 20,499 miles per annum, which is notably elevated for a luxury sedan of this era. Such mileage accumulation accelerates wear on consumables like brake pads, clutch components (if applicable), and suspension elements such as coil springs, shock absorbers, and suspension bushes. The rapid mileage suggests either intensive daily use, frequent short trips that stress the drivetrain, or a combination of both. This usage pattern may have contributed to premature wear on internal components, particularly in the drivetrain, transmission, and exhaust system, where higher temperatures and mechanical stress can degrade materials faster. Additionally, prolonged exposure to road conditions, such as potholes or rough surfaces, could exacerbate wear on the suspension and steering systems, potentially leading to premature failure of critical components if not serviced appropriately. For the prospective buyer, the most critical areas to inspect during a thorough examination are the braking system, suspension, and drivetrain. Begin with a visual and functional check of the brakes, focusing on the discs and pads for signs of glazing, warping, or excessive thickness loss. Listen for any unusual grinding or squeaking during braking, which could indicate worn pads or warped discs. The suspension should be inspected for uneven tyre wear patterns, which may signal misalignment or failing struts. Check for excessive play in the steering wheel or clunking noises from the suspension during cornering, which could point to worn suspension bushes or broken coil springs. The drivetrain, particularly the differential and transmission, should be examined for leaks around the driveshaft joints and the transmission fluid level and condition, as high mileage may have led to internal wear or fluid degradation. A test drive should include acceleration from a standstill, as well as hard braking and cornering, to identify any unusual noises or vibrations that could signal underlying issues. Beyond the functional checks, the buyer should also address practical concerns related to the vehicle’s age and usage profile. Given the high mileage, the tyre tread depth should be verified, with a focus on any areas of uneven wear that could indicate misalignment or suspension failure. Tyres should also be inspected for sidewall cracking or perishing, which can weaken the tyre structure and compromise safety over time. The 12-volt battery should be tested for charge retention and overall health, as high-mileage vehicles are more susceptible to battery failure due to increased electrical demand from accessories and the vehicle’s systems. Additionally, the fluid levels—particularly the engine oil, coolant, and brake fluid—should be checked, with a recommendation to replace the oil and filter according to the manufacturer’s guidelines, which for this model would typically be every 15,000 to 20,000 miles or every 12 months, whichever comes first. The coolant should be flushed and replaced every 5 years or 60,000 miles to prevent corrosion and thermal breakdown, and the brake fluid should be replaced every 2 to 3 years to maintain hydraulic efficiency. Finally, a review of the vehicle’s service history, even if not provided by the DVSA, would be invaluable to confirm that all scheduled maintenance—such as timing belt replacement, spark plugs, and exhaust system inspections—has been conducted. This proactive approach will help mitigate the risks associated with high mileage and ensure the vehicle remains roadworthy and reliable for years to come.