1987 Mercedes 420 4.2L Petrol · WJC 10

The 1987 Mercedes 420 presents a stable and improving mechanical trajectory, culminating in a clean pass at its most recent test on 22 December 2025. The maintenance trend over the past five years shows a clear resolution of minor defects, moving from advisories in 2023 to zero recorded defects in both 2024 and 2025. This indicates diligent recent upkeep, with no recurring mechanical or structural failures emerging in the latest assessments. The vehicle currently meets all required roadworthiness standards without any outstanding advisories. Covering roughly 3,181 miles annually over its 39-year lifespan, this example has seen exceptionally light use. The annual increments remain consistent, averaging around 1,200 to 1,300 miles per year between tests, with no sudden spikes or alarming gaps in the recorded history. Such low mileage typically preserves drivetrain components, though prolonged periods of standing can cause deterioration in rubber suspension bushes, brake calipers, and tyre sidewalls. The steady accumulation suggests regular, rather than sporadic, use by the current keeper. Despite the clean recent MOT records, a physical inspection must focus on the long-term effects of low-mileage aging. The 2023 test flagged a blocked nearside washer jet and a loose parking brake lever, both of which were rectified for the 2024 test, but buyers should verify the handbrake ratchet mechanism operates correctly. Given the vehicle's age and extended stationary periods, thoroughly inspect the structural integrity of the chassis and sills for corrosion, a common affliction on Mercedes of this era. Check the condition of the suspension bushes and coil springs, as perished rubber and seized components often plague vehicles that sit idle. Examine the brake discs and calipers for surface rust and binding, and assess the tyre tread depth and sidewall cracking, as low annual mileage frequently leads to age-related degradation rather than wear.