2018 BMW 420 2.0L Petrol · RO10 PET

The most recent DVSA examination on 24 January 2026 resulted in a PASS, although it should be noted that the vehicle failed just two days prior on 22 January 2026 due to a Dangerous defect recorded for the Offside Front Tyre, where tread depth had fallen below the statutory 1.6mm minimum on a 225/45 R18 size, accompanied by an advisory for the Nearside Front Tyre being worn close to the legal limit and feathered on its edges. Considering the broader MOT trajectory, the vehicle demonstrated a commendable clean record from 2021 through 2024, with no advisories whatsoever across four consecutive passes, before the under-tray advisory first appeared in February 2025 and persisted into 2026. The sudden emergence of a Dangerous tyre failure at the start of 2026, following years of entirely unblemished tests, suggests that the vehicle may have been left standing for extended intervals, allowing the tyres to deteriorate unevenly rather than wearing down through active use, and any prospective purchaser should treat this as a cautionary indicator regarding the owner’s recent attention to routine maintenance. With 41,893 miles recorded over an eight-year period, the 420 has covered an average of approximately 5,200 miles annually, which is notably below the typical mileage profile for a vehicle of this age and class. Such low annual usage is characteristic of a second car, a commuter used only on certain days, or a vehicle that has experienced extended periods of inactivity, and it carries several mechanical implications. Long standing periods can accelerate corrosion on brake discs due to surface oxidation, promote seizing or binding of calliper slide pins and handbrake mechanisms, degrade the 12V battery through repeated shallow discharge cycles, and contribute to the perishing and cracking of tyre sidewalls and suspension rubber components even where tread depth appears adequate. Given this low-mileage profile, a prospective buyer should conduct a particularly thorough physical inspection beyond the MOT record. The tyres should be examined closely for age-related sidewall cracking, checking the DOT date code to confirm they are not excessively old, and the brake discs should be inspected for lipping and significant surface corrosion, which can manifest as grinding or vibration under the initial application of the brakes. The handbrake should be tested on an incline to confirm it holds firmly, as caliper pistons that have remained retracted for prolonged periods can seize, and the underside should be raised or the under-trays removed where possible to inspect for fluid leaks from the engine, transmission, and differential, as well as to assess the condition of the suspension bushes, coil springs, and anti-roll bar links for any perishing or corrosion. A thorough test drive should listen for any clonks or knocks from the suspension over speed humps and uneven surfaces, verify that the steering remains precise without vibration, and confirm that the brakes pull up evenly without shudder or judder. Finally, given the calendar age of the vehicle, attention should be directed towards time-based servicing items that do not necessarily correlate with mileage but require periodic replacement regardless. The brake fluid should be confirmed as having been changed within the past two years, as it is hygroscopic and degrades in performance over time, the coolant should be checked for condition and replaced on the manufacturer’s schedule, and the automatic or manual transmission fluid should be verified in line with BMW’s recommended intervals, particularly if a fluid change is due based on age rather than distance. The 12V battery should be load-tested, especially given the low usage pattern that may have led to chronic undercharging, and the air conditioning system should be verified for proper function with the refrigerant having been recharged or serviced within a sensible interval. Verifying a complete main dealer or specialist service history with corresponding invoices will be essential to confirm that time-sensitive items have been attended to, and given the persistent under-tray advisory, a pre-purchase inspection with the under-trays removed would be strongly advisable to confirm the structural and mechanical condition of components that the tester was unable to fully evaluate.