1985 Mercedes 500 5.0L Petrol · C900 GOV

The most recent MOT, dated 2 October 2025, was a pass but carried three advisories: front and rear brake discs are worn, pitted or scored, and the constant‑velocity boots on both rear drive‑shaft joints are severely deteriorated. Earlier MOTs show a pattern of improving compliance – the dangerous front‑suspension corrosion that caused a failure in March 2021 has not re‑appeared, and the only recurring notes are the rear‑brake binding advisories from 2023 and 2024, which have not escalated to a failure. Overall the maintenance trend can be described as stabilising, with the major structural issue resolved but a handful of wear‑related items now persisting. At 55,537 mi recorded over 41 years the vehicle averages roughly 1,350 mi per annum, a very low annual mileage for a 1985 Mercedes‑Benz 500. Such limited use often points to long periods of storage or very gentle driving, which reduces wear on engine and drivetrain components but accelerates age‑related degradation of rubber, seals and metal. Low utilisation can allow brake discs to develop surface rust, calipers to seize, and battery plates to sulphate, while the chassis and suspension may suffer from corrosion that is not mitigated by regular motion. The mileage itself does not suggest excessive wear, but the age of the car means that many components are likely approaching the end of their service lives irrespective of distance travelled. For a prospective buyer the rear‑drive‑shaft CV boots should be inspected closely for grease leakage, cracks or torn fabric. Any fresh grease on the rear wheel arches or a whine that changes with acceleration may indicate an imminent joint failure. The brake system warrants immediate attention: the discs are already scored, so measuring the remaining thickness against the manufacturer’s minimum is essential, and replacement of both discs and pads is advisable to avoid shudder or reduced stopping performance. The off‑side rear brake’s slight binding noted in successive MOTs may be caused by a sticking caliper or warped disc; a test‑drive should reveal any pulsation in the pedal, uneven braking feel or a dragging sensation when coasting. The front suspension mounts, while not currently flagged, were previously deemed dangerously corroded, so a visual check for rust at the ARB mounting points and for cracked or collapsed bushings is prudent. Given the car’s age and low mileage, a thorough visual and tactile examination of age‑related items is essential. Examine all tyre sidewalls for cracking, dry‑rot or hardening of the rubber, and verify that tread depth is even. Inspect the 12‑volt battery for sulphation, low cranking voltage and any bulging cells, and consider a load test. Check that engine oil, brake fluid and coolant are fresh‑smelling, clear and within service intervals, as fluids can degrade even when the vehicle sits. Finally, look for corrosion on the chassis, under‑body, exhaust and fuel lines, and ensure that any rust is surface‑level rather than structural before committing to purchase.