2017 BMW 420 2.0L Diesel · RUM 2N

The mechanical story of this 2017 BMW 420 is one of broadly consistent roadworthiness across its recorded test history, punctuated by a single, isolated but significant failure event in January 2024. Eight tests are documented between April 2021 and January 2026, and seven of these recorded a pass with no advisories at all. The anomaly sits in January 2024, when the vehicle failed on two fronts: registration plates that did not conform to the required specification on both the front and rear, and, more seriously, dangerous defects on both front tyres. The nearside and offside front tyres were each found to have bulges caused by structural separation, a condition that carries immediate implications for handling and braking grip. The fact that the car returned to the same test centre just two days later and passed cleanly, with no defects recorded, suggests the plate issue was rectified and both front tyres were replaced. The most recent test on 21 January 2026 passed with only a minor advisory for a nail in the offside rear tyre, indicating the vehicle has remained free of structural or safety defects since that isolated failure. Annual mileage on this 420 sits at roughly 6,623 miles per year over its nine-year life, a figure that is broadly typical for the age bracket rather than notably low or high. The recorded tests span April 2021 through January 2026, and the mileage progression across these dates is consistent with steady, moderate use rather than long periods of standing or sudden high-mileage accumulation. There are no multi-year gaps in testing that would suggest extended lay-up, which means rubber components such as tyres and suspension bushes, and brake system consumables, have been subjected to regular working cycles rather than suffering the dry-rot and seizure risks associated with prolonged inactivity. Mechanically, this usage pattern argues against the kind of accelerated wear you might see on a high-mileage example, but equally it means there has been sufficient running to prevent the dormant corrosion issues that can strike brake discs, callipers, and handbrake mechanisms on rarely-driven cars. For a prospective buyer, the tyre failure from January 2024 is worth probing as a one-off rather than a recurring theme, but it does underscore that the front axle components took a genuine impact at some point between tests. On a road test, pay close attention to steering response and front-end feel: any vagueness through the wheel, tramlining over uneven surfaces, or a shimmy under braking could indicate that the replacement tyres were not balanced or aligned correctly after the swap, or that the underlying cause of the structural failure, such as a sharp-edged kerb impact, may have knocked the tracking or damaged a wishbone bush. Listen for clonks or knocking from the front suspension over speed humps and uneven tarmac, as the failure pattern of two simultaneously bulged tyres is unusual and may hint at a pothole strike that also stressed the suspension arms or top mounts. Beyond the front axle, the rest of the recorded history is reassuringly clean, with no advisories relating to brake pipes, discs, callipers, coil springs, subframes, or corrosion, which is notable on a nine-year-old BMW where corrosion advisories on arches, sills, or underbody components can begin to appear. Nevertheless, given the age, a thorough physical inspection beneath the vehicle is advisable, particularly around the rear axle mounting points and the exhaust system, areas that would not necessarily be flagged at MOT level until deterioration becomes pronounced. On the test drive, check for any pulling under hard braking, which could indicate a binding caliper on the offside rear where the recent advisory nail was found, and verify that the electronic parking brake releases and re-engages cleanly, as rear caliper mechanisms on BMWs of this era are known to seize with infrequent use. Finally, confirm that the replacement front tyres fitted in January 2024 are date-marked appropriately and have even wear across both edges, which will tell you whether the tracking and suspension geometry are within tolerance.