2014 Mercedes-Benz S-Class 3.0L Diesel · L88 OAR

The most recent DVSA MOT test on 26 March 2026 resulted in a Pass with a single advisory note concerning the rear brake discs, which were recorded as worn, pitted or scored but not seriously weakened on both sides. Looking at the broader pattern across the last several tests, the maintenance trend is broadly stable but shows a persistent and recurring focus on braking components. The front discs were also flagged for similar wear in 2024, and advisories for rear disc wear have appeared consistently across 2026, 2025 and 2024, while brake disc wear was called across all four corners in 2023. There is no evidence of major suspension, structural, steering or exhaust failures, which is encouraging for a vehicle of this age and mileage, but the brake-related advisories should not be dismissed as routine. The recorded mileage of 170,240 miles over twelve years equates to an annual average of approximately 14,187 miles, which is notably high for a luxury saloon of this vintage and considerably above the typical UK average of 7,000 to 9,000 miles per year. There are no extended gaps in the MOT record that would suggest prolonged periods of standing, and the relatively even spacing of tests indicates the car has been in regular service throughout its life. Sustained high-mileage use on a Mercedes-Benz S-Class places cumulative demand on the engine, automatic transmission, air suspension system, drivetrain mounts and interior trim, all of which carry higher replacement costs than on more modest machinery. It is essential to verify the documented service history, particularly confirming that automatic transmission fluid, engine oil, coolant and brake fluid changes have been carried out at manufacturer-specified calendar and mileage thresholds, regardless of any MOT advisories. Given the recurring brake disc advisories, a prospective buyer should undertake a focused inspection of the braking system. On a test drive, listen for any grinding, squealing or pulsation through the brake pedal, which would suggest that the pitted rear discs have now reached a serviceable limit or that pads are running unevenly against corroded disc surfaces. With the engine running and the vehicle stationary, check for any signs of binding calipers, such as a rear wheel which feels hotter than the opposite side after a short drive. Given that front discs were also previously flagged, inspect the thickness of both front and rear discs with a micrometer if possible, and budget for replacement of discs and pads together, which on a heavy S-Class is a four-corner cost that can run into four figures. A pulsating steering wheel under braking would confirm front disc distortion, while any pulling to one side could suggest a seized guide pin or uneven pad wear. Beyond the braking system, the high annual mileage and twelve-year age warrant close attention to age-related items that do not always show on the MOT. Inspect all four tyres for sidewall cracking or perishing, particularly the inner shoulders which are prone to uneven wear on heavy rear-driven vehicles, and check the production date codes on the sidewalls as rubber degrades with age regardless of tread depth. The 12-volt battery should be load-tested, as a twelve-year-old unit is well beyond its expected service life. Examine the underbody, exhaust mounting rubbers and suspension components for corrosion or perished bushes, and verify that the air suspension system rises promptly and holds the vehicle level, as replacement of air struts or the compressor on an S-Class is a notably expensive rectification. Finally, ensure that the full Mercedes-Benz main agent or specialist service history is present and that the digital service interval counter has been correctly maintained, as this will give the clearest indication of how the mechanical components have been cared for over this very high-mileage life.