2015 BMW 420 2.0L Diesel · LS65 ETA

The latest MOT test on the 2015 BMW 420i recorded a clean pass on 2026-07-11, marking a positive turnaround following a failed inspection in early 2026. While the vehicle has demonstrated a history of minor and advisory issues—particularly concerning rear coil spring corrosion and front anti-roll bar linkage ball joint deterioration—this most recent test indicates a stabilization of the vehicle’s condition. The absence of major defects in the past three months suggests that the previous failures were likely isolated incidents rather than signs of progressive mechanical degradation. However, the recurring advisories on coil springs and anti-roll bar ball joints warrant careful attention, as these components are critical to suspension integrity and ride quality. The vehicle’s overall maintenance trend appears to be improving, but buyers should remain vigilant to ensure these recurring concerns are addressed promptly to prevent further wear or failure. The recorded mileage of 116,517 miles for a vehicle aged approximately 11 years represents a moderate annual usage rate of around 10,592 miles per year, which is within the expected range for a BMW of this era. This level of mileage is neither exceptionally low nor alarmingly high, but it does indicate consistent, albeit not particularly aggressive, driving conditions. Lower mileage could suggest periods of prolonged standing or lighter use, potentially leading to accelerated wear from standing corrosion, particularly in suspension components and exhaust systems. Conversely, higher mileage might imply more rigorous use, which could accelerate consumable wear in brakes, tyres, and fluid degradation. Given the vehicle’s history, the mileage alone does not suggest immediate mechanical concerns, but the combination of mileage and recurring MOT advisories underscores the importance of a thorough pre-purchase inspection to assess wear progression and structural integrity. Given the recurring MOT advisories on rear coil springs and front anti-roll bar ball joints, prospective buyers should conduct a meticulous inspection of the suspension system. The corroded coil springs, noted in multiple advisories, indicate that the aluminium or steel construction is suffering from oxidation, which can lead to premature failure if not addressed. Visually inspect the springs for any signs of rust, cracks, or deformation, and listen for unusual clunking noises when driving over bumps or uneven surfaces—these could signal worn suspension bushes or binding components. The anti-roll bar ball joints, particularly the front left, show severe deterioration, which may cause excessive body roll, poor handling, or even binding when cornering. Check for play in the joints by applying force to the wheel while the vehicle is stationary, and verify that the dust covers are intact to prevent further ingress of contaminants. If these components are beyond economical repair, the buyer should be prepared for potential suspension replacement costs, as BMW’s suspension design is known for its complexity and susceptibility to wear. For a vehicle of this age and mileage, a comprehensive pre-purchase inspection should also include a thorough examination of the braking system, exhaust emissions, and general structural integrity. Given the exhaust failure noted in 2026, which emitted visible black smoke during acceleration, the buyer should verify that the catalytic converter and exhaust manifold are free from blockages or damage, as well as inspect for any signs of rust or leaks in the exhaust system. The presence of black smoke can also indicate a fuel-related issue, such as a faulty injector or fuel pressure problem, which may require further diagnostic testing. Additionally, check the brake discs, pads, and calipers for signs of corrosion, warping, or binding, especially if the vehicle has been stationary for extended periods. Corrosion on brake discs can lead to reduced braking performance and premature wear of pads, while binding calipers may cause uneven brake wear or shuddering when braking. Finally, inspect the tyres for sidewall perishing, uneven wear patterns, or signs of hydroplaning risk, as tyres of this age may have dried out or cracked due to prolonged exposure to the elements. A 12V battery health check is also prudent, as older vehicles may suffer from reduced cranking power or electrical gremlins, particularly if the vehicle has been left unused for significant periods. Lastly, verify that the service book records are up to date, as the BMW 420i requires regular oil changes, filter replacements, and fluid top-ups to maintain performance, especially given the high mileage.