1989 Mercedes S-Class 4.2L Petrol · G336 YEE

The 1989 Mercedes S-Class presents a stable, if narrowly focused, mechanical profile based on its recent DVSA MOT record. The most recent test, conducted on 17 April 2026 at 15,519 miles, resulted in a pass, though the tester flagged advisories across all four tyres for cracking and perishing. This specific issue is not a new development but a recurring pattern. In the April 2025 test at 15,466 miles, the exact same advisories were recorded, and a similar advisory appeared in April 2022 at 15,356 miles. The trend for this vehicle is stable; the underlying mechanical condition appears consistent, but the persistent neglect of tyre condition suggests a pattern of minimal, reactive maintenance rather than proactive care. There are no recorded failures, and the advisories have remained minor and isolated to the rubber components. The mileage accumulation is exceptionally low for a vehicle of this age. Between the March 2023 test at 15,396 miles and the April 2026 test at 15,519 miles, a span of over three years, the odometer advanced by just 123 miles. This equates to an average of roughly 419 miles per year over the vehicle's 37-year lifespan. Such minimal use points to long periods of standing, which is a critical factor in the recurring tyre advisories. Rubber perishes from age and ozone exposure, not just wear from driving. The sparse mileage data, with tests often spaced a full year apart, confirms this is a vehicle that sees very little road use, making the condition of its consumables a direct reflection of its storage environment rather than its mechanical durability. A prospective buyer must treat the tyre advisories as a serious safety concern rather than a minor cosmetic note. The cracking noted between the treads indicates significant age-related degradation of the rubber compound, drastically increasing the risk of a high-speed blowout. All four tyres require immediate replacement before the vehicle is driven at any meaningful speed. Beyond the tyres, the low mileage and long stationary periods demand a thorough inspection of the braking system. Brake calipers can seize and discs can corrode with minimal use, leading to binding or uneven braking. The fuel system should also be examined for stale fuel and degraded rubber hoses, which can cause leaks or engine running issues. The suspension bushes, while not flagged in the advisories, are likely dried out and perished from age, which will affect ride quality and handling. A compression test and a detailed underbody inspection for structural corrosion are essential, as these classic Mercedes models are prone to rust in sills, floor pans, and subframe mounts, particularly if stored in damp conditions.