1997 Mercedes 308 D 2.3L Diesel · Q557 BRM

The most recent MOT, carried out on 20 February 2024, was passed but returned a series of advisories covering the brake pipe, several front and rear suspension mounting points, and the front brake discs. Earlier tests in 2022 and 2021 also passed, yet each highlighted different areas of concern – front brake disc condition, a minor exhaust leak, corrosion on brake hose ferrules, slight chassis and floor corrosion and a steering box that showed marginal movement. The pattern shows a vehicle that has been kept road‑worthy but is now accumulating age‑related wear; the number of advisories has risen rather than fallen, indicating a gradual deterioration rather than an improving condition. At 146,128 miles for a 1997 model the average annual mileage works out at just over 5,000 miles, well below the typical 10,000‑12,000 miles per year seen on many contemporaries. Such low utilisation often points to periods of infrequent use or long storage intervals, which can be as detrimental as high mileage because components may dry out, seals can harden and corrosion can set in unnoticed. The modest mileage does not, however, erase the fact that the car is now approaching three decades of service, meaning that many wear items will be near the end of their design life regardless of the odometer reading. A prospective buyer should give particular attention to the brake system. The front brake discs were noted as pitted and scored in 2022; while not yet structurally compromised, they are likely approaching the limit of useful life and could manifest as a pulsating pedal, increased stopping distances or audible squeal under hard braking. The front brake hose shows slight corrosion at the ferrule, which can lead to hose failure and fluid loss, so a visual inspection for cracks, swelling or wetness around the hose is essential. The brake pipe corrosion noted in the latest test may indicate rust inside the pipe, potentially causing a spongy brake feel; listening for a faint hissing or feeling for a soft pedal under gradual pressure will help confirm its condition. Replacing the discs, hoses and possibly the pipe should be budgeted for in the near term. Beyond the brakes, the multiple advisories about corrosion on suspension mounting points suggest that the sub‑frame and bulkhead areas have been exposed to moisture, which can eventually lead to weakened mounting bushes, altered alignment and clunking noises when negotiating bumps. A thorough road‑test should include feeling for any knock or unevenness from the front and rear corners, especially over uneven surfaces, and checking that the steering remains smooth without excessive play – the earlier note of a slightly stiff steering and minor steering box movement may be early signs of wear in the rack or box bearings. The minor front exhaust leak should be inspected for cracks or perforations around the manifold and pipe joints; a faint hissing or a faint smell of exhaust at the front could indicate a worsening leak. Finally, verify that all external lamps, including the registration plate lamp, function correctly, and assess the condition of the tyres for sidewall cracking or dry rot, the battery for charge holding ability, and the general state of the chassis for any hidden rust that may have progressed during periods of inactivity. Addressing these items will give a clearer picture of the vehicle’s remaining serviceable life and the likely cost of bringing it to a reliable standard.