1989 Mercedes-Benz 420 4.2L Petrol · F721 RYH

This Mercedes-Benz 420 currently holds a valid MOT certificate, having passed the most recent test on 27 March 2025 with no defects recorded. The preceding test cycle, however, reveals an unusual pattern: two consecutive failures in March 2025 and March 2024, each followed by a pass within days. While the most recent pass suggests the vehicle cleared all mandatory checks, the repeated failures without recorded defects imply either administrative errors, a brief but unresolved mechanical issue, or a test centre’s inability to identify subtle faults. The lack of advisories or specific defect codes in any entry means no critical components—such as suspension bushes, coil springs, or binding calipers—were flagged as failing, but the repeated failures themselves warrant scrutiny of the vehicle’s long-term reliability. The recorded mileage of 128,801 miles over approximately 37 years equates to an average of around 3,481 miles annually, which is unusually low for a vehicle of this age. This suggests either limited use or prolonged periods of inactivity, both of which can accelerate wear in suspension components, brake systems, and fuel lines. Notably, there are no MOT entries between March 2023 and March 2024, a gap of 12 months where the vehicle may have been off the road entirely. Such extended periods without testing increase the risk of undetected corrosion—particularly in the chassis, exhaust system, or wheel bearings—and potential degradation of fluids or seals. The absence of advisories in any test also means no minor issues were flagged for attention, but this could simply reflect the tester’s discretion rather than genuine absence of wear. Given the repeated failures without defects, a buyer should prioritise a thorough inspection of the braking system, including rear brake binding, disc thickness, and caliper operation, as these are common failure points in older Mercedes models. The suspension—particularly the rear bushes and shock absorbers—should be checked for excessive play or corrosion, as these components degrade rapidly with age and inactivity. Structural integrity is another concern; the chassis and subframe should be examined for signs of rust penetration or weld fatigue, especially around the rear axle and fuel tank area. Finally, the exhaust system warrants close inspection for leaks or corrosion, as prolonged inactivity can accelerate rust through condensation. While the MOT history shows no overt failures, the pattern of repeated test cycles without defects suggests a vehicle that may have slipped through minor checks—something a pre-purchase inspection should verify.