1986 Mercedes 500 5.0L Petrol · D891 TWE

A four-decade-old Mercedes of this specification presenting a current pass certificate with no advisories is an encouraging starting point for any prospective buyer. The most recent test on 13 April 2026 was issued with no defects recorded, and the two prior annual tests at the same facility followed the same clean pattern, confirming a stable and improving roadworthiness trajectory rather than a deteriorating one. The only failure on the record came at the February 2024 retest, where both headlamp aim readings were outside tolerance on the same day the vehicle passed; this is a typical presentation of an older car that has simply drifted out of beam specification rather than any underlying structural or electrical concern, and it was rectified immediately. The single advisory worth noting is from February 2023, flagging a deteriorated dust cover on the offside front lower suspension arm ball joint, classed as minor at the time but worth monitoring given the age of the rubber components throughout the front axle. With 109,326 miles recorded across forty years, this vehicle averages roughly 2,733 miles annually, which is markedly low even for a classic that may have been used primarily for shows and summer touring. Such restrained mileage places far less mechanical fatigue on the drivetrain, transmission, and braking surfaces than typical accumulation rates, meaning internal wear on the engine, automatic gearbox, and rear axle is likely modest. However, low annual figures on a car of this vintage can equally reflect extended periods of standing, where seals, hoses, fuel system components, and ancillary electrics suffer from lack of use rather than wear. The consistent year-on-year pattern of testing suggests the vehicle has remained in regular use rather than laid up for long intervals, which is the more favourable interpretation for ongoing reliability. Given the ball joint dust cover advisory and the age of the front suspension, a thorough inspection of the offside front lower arm is essential, paying particular attention to any play or roughness when the wheel is rocked at twelve and six o'clock, and listening for clonking over uneven surfaces that would indicate the ball joint itself has worn beyond what the deteriorated cover would suggest. The nearside arm should be checked symmetrically, as dust cover deterioration on one side frequently precedes the same failure on the opposing joint. On test drive, listen for any knocking from the front end over bumps, particularly cats eyes and potholes, and feel for imprecise steering response or wandering that would point to worn bushes in the lower arms or the front subframe mountings. The headlamp aim failure, while minor, warrants confirming that both headlamp pods are operating correctly, with no flickering or uneven beam patterns suggesting tired earth connections or motor wear. Beyond the flagged items, this being a 1986 example means many of the rubber components throughout the braking and suspension systems are well beyond their intended service life, even if the MOT has not yet recorded any advisories. Brake pipes, flexi hoses, the master cylinder seals, and the flexible couplings in the steering system are all candidates for attention on a vehicle of this age, and a careful visual inspection underneath for any surface corrosion or weeping hydraulic fluid is advisable. Test the brakes firmly from speed and feel for any sponginess in the pedal that would suggest air ingress or perished flexi hoses, and check for any pulling to one side that might indicate a binding caliper. Finally, with such low annual mileage, verify that the coolant, engine oil, and transmission fluid have all been changed within sensible intervals, as standing periods can degrade these fluids even when the odometer remains static, and a reluctance to start from cold or any rough running would be the first tell-tale sign of a fuel system or ignition component that needs refurbishment.