2010 Mercedes-Benz S-Class 3.7L Diesel · LL10 JWN

The most recent DVSA examination on 8 February 2023 resulted in a Pass, although three advisories were recorded which mirror those noted on every test back to early 2020. Looking at the trajectory across the five most recent tests, the maintenance picture is broadly stable rather than deteriorating, but it is also not improving, because the same trio of advisories concerning the brake pedal rubber, front lower suspension arm ball joints, and rear suspension arm bushes with debonding has been carried forward unchanged year after year. There have been two failures in this period, both tyre related and both easily remedied, rather than structural or systemic mechanical failures, which suggests the vehicle has been generally well maintained on a service basis with only consumable issues interrupting otherwise clean passes. Annual mileage works out at roughly 10,000 miles per year, which is essentially average for a sixteen year old executive saloon and indicates regular rather than garage-bound use. The recorded odometer readings between tests show consistent accumulation of around twelve to fourteen thousand miles per year, with no extended gaps or unusually rapid blocks that would imply clock irregularity or prolonged standing. This is a positive sign for component longevity, as regular use tends to keep seals lubricated, brakes free from corrosion, and battery state of charge healthy, while still delivering enough mileage to warrant attention to wear items given the overall odometer reading approaching 160,000 miles. The persistent advisory concerning the brake pedal wearing smooth is a relatively minor issue indicating that the rubber grip surface has polished with age and foot traffic, reducing effective pedal friction particularly in wet conditions or for drivers wearing smooth-soled footwear. While not a failure item, a prospective buyer should be prepared for the pedal to be renewed at some point and should test the firmness of the pedal and the effectiveness of the servo assistance on a road test. More significant are the recurring advisories on the front lower suspension arm ball joints, which have shown slight play on both sides for at least four consecutive tests, and the rear suspension arm pin or bush advisories, which explicitly note debonding of the bushes on both nearside and offside. Bush debonding refers to the rubber separating from its metal carrier, which progressively allows more movement and typically produces clonking or knocking noises over bumps, vague steering response, and uneven rear tyre wear. On a test drive, listen carefully for any suspension noise particularly at low speed over uneven surfaces, and check for uneven or feathered tyre wear patterns which would confirm accelerating deterioration. At this age and mileage, replacement of the rear arm bushes and front ball joints should be considered an imminent budget item. Beyond the recorded advisories, the vehicle's age and mileage profile justify a thorough physical inspection of items which MOT testing does not necessarily cover. The brake discs and pads should be examined for wear and lipping, particularly as the original pedal advisory and high mileage imply significant braking usage, and a check for any binding caliper on a hot wheel after a drive would be prudent. Tyres of this age, regardless of tread depth, should be examined for sidewall perishing and cracking, and the spare wheel if present should also be checked. Fluid services should be verified regardless of MOT history; brake fluid absorbs moisture and should be renewed on age rather than mileage, while engine coolant, automatic transmission fluid on this Mercedes, and power steering fluid all degrade with calendar age. The 12V battery is likely to be several years old and should be load tested, and a check for any oil leaks from the engine, transmission, or differential given the high mileage is advisable. Finally, a diagnostic scan for stored fault codes, particularly relating to the air suspension, ABC system, or electronic stability control which are common concerns on S-Class vehicles of this era, would provide additional reassurance before purchase.