2015 BMW 420 2.0L Diesel · ML13 BAS

The most recent MOT on 2 May 2026 was recorded as a failure, the dangerous defect being a nearside rear tyre whose tread depth fell below the legal 1.6 mm limit. The test also carried a series of advisories concerning wear on both front lower suspension arm pins or bushes, a non‑functioning off‑side front fog lamp and excessive play in the off‑side steering rack inner joint. Over the preceding three years the vehicle has shown a pattern of recurring tyre wear warnings, a one‑off brake service‑brake fluctuation failure in 2025 and repeated notes on front suspension bush wear, indicating that while some issues have been addressed, the overall maintenance trend is mixed rather than clearly improving. At 86,905 miles the car averages roughly 7,900 miles per year, which is typical for a 2015 model and suggests no extreme mileage‑related wear. However the consistent tyre‑wear advisories imply either a driving style that favours aggressive cornering, uneven tyre rotation or possibly the use of softer compound tyres. The relatively modest annual mileage also raises the possibility of periods of inactivity, which can accelerate corrosion of suspension components, cause brake disc rust and lead to battery sulphation if the vehicle has been stored for extended intervals. A prospective buyer should give the rear tyres immediate attention; verify the current tread depth on both sides, inspect the sidewalls for cracking, dry rot or delamination, and consider replacing the set if the DOT code indicates they are more than six years old. The front lower suspension arm bushes and pins should be examined for looseness, excessive play or oil seepage, and any clunking or knocking noises when driving over bumps should be noted. The steering rack’s inner joint must be checked for free play – a noticeable wobble or loose feel at the wheel when turning at low speed is a symptom of the advisory. The off‑side front fog lamp should be tested for operation and the lamp housing inspected for moisture ingress, while the off‑side steering rack play should be confirmed by a qualified technician before a full service. In addition, the brake system warrants a thorough inspection: feel for any pulsation or fluctuating pedal pressure that could be a residual effect of the 2025 service‑brake fault, and assess the rear brake disc for surface rust or scoring that may require resurfacing or replacement. Given the vehicle’s age, a battery load test is advisable, as standing periods can diminish capacity, and the electrolyte level should be checked if it is a conventional lead‑acid unit. Finally, confirm that the engine tray and under‑tray are securely fitted, look for any signs of oil or coolant leaks around the engine bay, and ensure that all scheduled fluid changes (engine oil, coolant, brake fluid) have been performed in line with the service book, as calendar‑based degradation can affect reliability even when mileage is modest.