2021 Mercedes-Benz S 350 L AMG Line Premium + D A 2.9L Diesel · OO07 TEX

A heavy-use executive saloon with a tight and fairly clean MOT record, though the most recent test in September 2025 did pass without recording any defects. Two tests were conducted within a day of each other in September 2024, with the first resulting in a failure on nearside front and rear tyres that had cuts deep enough to reach the ply or cords, alongside the same brake-related advisories that then carried over to the re-test which passed. The presence of both advisory categories on the failed test and the subsequent pass indicates the tyre issues were addressed prior to the re-test, while the brake wear items were permitted to remain as monitored items. With only this single failure recorded and no structural or corrosion advisories across the available history, the immediate roadworthiness picture is stable, but the front brake component wear flagged in 2024 warrants close physical inspection at the current mileage. At roughly 94,690 miles over five years, this S-Class is accumulating close to 19,000 miles annually, which is high for a luxury executive saloon of this age and well above the average for the segment. Sustained high mileage of this nature accelerates wear on the consumables and chassis components typically associated with prolonged motorway use, including brake discs and pads, coil springs, suspension bushes, and the driver and engine mounts. Although no major mechanical failures are recorded in the MOT history, the annual mileage profile suggests that any rubber-based components, dampers, and drivetrain flexible elements will have been worked hard, and may be approaching the upper end of their effective service life even though they have not yet been flagged at test. Buyers should treat the odometer reading as a significant factor when prioritising pre-purchase inspection items, particularly those relating to ride quality and secondary ride refinement, which are hallmarks of this model. Given that the front brake pads were recorded as wearing thin and the front discs were noted as lipped in 2024, a prospective buyer should carry out a direct physical inspection of the front braking system before purchase. Measure the remaining pad friction material thickness against the manufacturer minimum specification, and run a finger around the outer edge of each front disc to feel for a pronounced lip which would confirm disc wear or replacement requirement. On a test drive, listen for any binding caliper noise or scraping from the front axle, and test for brake pedal judder under firm application from higher speeds, as this would indicate disc run-out or distortion rather than a simple pad replacement need. The tyre cuts recorded on both nearside corners in 2024 are a useful reminder to inspect all four corners and the full circumference of the fitted tyres for any sidewall damage or embedded debris, particularly if non-run-flat items have been fitted. With high annual mileage, also pay close attention to the condition of the suspension, listening for any clonks or knocks over sharper bumps at low speed which would suggest worn anti-roll bar drop links or top mount bearings. On the diesel powertrain, test for any hesitation, uneven idle, or excessive smoke under load, and check for oil leaks around the engine sump and turbo connections. Finally, on the air-suspension variants of this model, listen for any air compressor cycling noise after shutdown and observe whether the vehicle settles overnight, as air strut degradation is a known long-term wear item on high-mileage S-Class vehicles of this generation.