2021 Mercedes-Benz S 350 L AMG LN Prem + Exec D A 2.9L Diesel · K1 XEC

The vehicle most recently passed its DVSA MOT test on 16 July 2026 with no defects or advisories recorded, continuing an unbroken run of clean test outcomes across the documented history covering 2024, 2025, and 2026. This consistent pattern of pass results with no recorded advisories or failure items suggests a well-maintained example from a legislative test standpoint, indicating that the wear-related items typically scrutinised at annual test, including braking efficiency, suspension component condition, lighting and signalling function, tyre condition, and exhaust emissions, have all remained within statutory thresholds. While the absence of advisories is a positive indicator, it is worth noting that the MOT represents only a snapshot of roadworthiness at the time of test and does not necessarily reflect the full mechanical condition of the vehicle or its longer-term service requirements. With a recorded mileage of 115,919 miles on a 2021 registration, the vehicle is averaging approximately 23,184 miles per year over its five-year life, which is substantially above the national average and places this S-Class firmly in the high-mileage category. Annual mileages at this level, particularly when combined with the premium long-wheelbase executive specification, accelerate wear on consumable and drivetrain components such as brake discs and pads, tyres, suspension bushes, coil springs, anti-roll bar links, and the air suspension system commonly fitted to this model. The consistent yearly test cycle with steadily accumulating mileage suggests the vehicle has been in regular use rather than left standing for extended periods, which is generally favourable for mechanical components prone to seizing or degrading through inactivity, such as brake calipers, exhaust systems, and battery cells. Given the clean MOT history but the elevated annual mileage, a prospective buyer should focus their pre-purchase inspection on the higher-wear items that may not yet have reached failure thresholds but could be approaching scheduled replacement. The air suspension system, a known maintenance consideration on S-Class vehicles of this era, should be carefully checked for any signs of sagging at standstill, slow air strut response, or dashboard warnings relating to the Active Body Control or Airmatic system. Brake discs should be inspected for lipping, hot spots, or corrosion pitting, as discs worn close to minimum thickness may pass an MOT but provide diminishing performance, and the condition of the rear flex discs and prop shaft centre bearings should be assessed given the diesel-automatic powertrain configuration. On a road test, listen for any clonks or knocks from the front suspension over speed bumps, particularly from the upper and lower control arm bushes and anti-roll bar drop links, and check for any pulling under braking, steering vagueness, or uneven tyre wear which might indicate geometry or suspension geometry component wear. Beyond the mechanical systems, several age and mileage related items warrant particular attention regardless of the clean MOT record. The 12V battery, which on modern Mercedes-Benz vehicles is often housed in the engine bay or boot, should be load tested as auxiliary battery degradation is common and can trigger various electrical faults. Engine oil, diesel fuel filter, air filter, transmission fluid (where serviceable), and differential fluid should all be verified as changed in line with the manufacturer's schedule, as calendar-based fluid degradation continues regardless of mileage patterns. The diesel particulate filter should be confirmed as healthy, ideally through a diagnostic read of its differential pressure and regeneration history, given the urban and short journey usage that executive vehicles frequently endure. Tyres should be examined closely for age-related sidewall perishing and cracking rather than just tread depth, as tyres fitted several years prior may have degraded rubber compounds even if the tread remains legal, and a full Mercedes-Benz specialist service history with documented component replacement would substantially strengthen any purchasing decision on this high-mileage but otherwise clean history S-Class.