2017 BMW 420 2.0L Diesel · P5 MML

The 2017 BMW 420 presents a stable and largely positive roadworthiness picture at its most recent MOT on 18 September 2025, when it passed at 24,523 miles. The only defect recorded was an advisory for a small bulge on the offside front tyre sidewall, indicating early structural deterioration of that specific tyre rather than a systemic fault. The preceding test on 10 September 2024 also passed cleanly at 22,855 miles, though that same day there was a failed attempt at the identical mileage for a nearside front inner tyre bulge, which was clearly rectified before the pass was issued. The overall maintenance trend is therefore stable, with no recurring mechanical or structural failures. The vehicle has not been flagged for any suspension, braking, exhaust, or structural corrosion defects across the entire recorded history. The mileage profile is notably low for a nine-year-old vehicle. Between the September 2023 pass at 20,048 miles and the September 2024 pass at 22,855 miles, the car covered just 2,807 miles over twelve months. From September 2024 to September 2025, the increase was only 1,668 miles. This equates to roughly 2,725 miles per year over the vehicle's life, well below the UK average of approximately 7,000 to 8,000 miles annually. Such low usage can preserve mechanical components but also raises the question of prolonged stationary periods, which can cause flat-spotting of tyres, brake surface corrosion, and moisture accumulation in fluids and cavities. The mileage progression is consistent with no sudden spikes, suggesting genuine light use rather than a rolled-back odometer. The recurring theme across the MOT record is tyre sidewall damage rather than mechanical wear. In September 2023, the vehicle failed at 20,048 miles for a deep cut to the nearside rear tyre reaching the ply or cords, and in September 2024 it failed for a structural bulge on the nearside front inner tyre. Both faults relate to tyre integrity rather than underlying suspension or steering defects, but two separate tyre structural failures in consecutive years warrant closer inspection. A prospective buyer should examine all four tyres for sidewall bulges, cuts, and uneven wear, and check the wheel alignment and suspension bushes for any damage that could be causing repeated tyre damage. The front suspension arms, ball joints, and track rod ends should be inspected for play, as impact damage from potholes is a common cause of tyre sidewall failure on BMW vehicles of this era. Beyond the tyre-related advisories, the absence of any brake, exhaust, or structural corrosion defects across four recorded tests is encouraging for a vehicle of this age. A buyer should still verify the condition of the brake discs and pads, particularly given the low mileage and potential for surface corrosion from infrequent use. The underside should be checked for any signs of corrosion to the subframe, sills, and jacking points, as even low-mileage vehicles can suffer if stored in damp conditions. The engine oil and coolant should be inspected for condition and level, as infrequent use can lead to moisture contamination. Overall, the MOT record indicates a mechanically sound vehicle with no serious structural or mechanical concerns, though the pattern of tyre damage suggests a careful physical inspection of the wheels and suspension is advisable before purchase.