2015 BMW 420 2.0L Petrol · LK65 XKM

A pattern of recurring rear‑oil‑leak advisories combined with a handful of outright failures – notably a split constant‑velocity boot in 2022, thin rear brake pads and a pitted rear disc in 2023, and a missing rear‑wheel fixing the same year – frames the vehicle’s recent MOT story. The latest 10 August 2026 test ended in a pass after the off‑side front position lamp was rectified, but the rear‑oil‑leak advisory remains, indicating that the underlying source has not been fully resolved. At 131,110 mi spread over roughly eleven years the average annual accumulation sits at about 11,900 mi, which is within the normal range for a BMW 4‑Series of this age. The MOT record shows a test each year without long gaps, suggesting the mileage has been logged consistently rather than accumulated during unrecorded periods of heavy use. This steady usage profile means wear on consumables such as tyres, brakes and suspension components is likely to be proportional to the recorded mileage rather than the result of undocumented high‑stress episodes. When inspecting the rear‑oil‑leak issue, look for fresh oil stains beneath the differential and around the rear‑axle seals; a persistent drip can herald seal degradation that may eventually affect rear‑wheel bearing life. The 2022 CV‑boot split should be checked for grease splatter on the inner axle and for any clicking or whine when applying torque, which would indicate joint contamination. The front‑outer suspension arm pin or bush noted as worn in 2022 should be examined for excessive play or clunking over bumps, and any tyre cuts reported in 2022 and the near‑side front tyre damage flagged in 2025 should be inspected for tread separation or sidewall cracking that could develop into a failure. The rear‑brake advisories from 2023 merit a thorough road‑test: listen for squeal or grinding on deceleration, feel for a soft or pulsating pedal, and verify that the disc surface is free of deep scoring. Confirm that the off‑side front position lamp now illuminates correctly and that all wheel fastenings, particularly the previously missing near‑side rear wheel fixing, are present and torqued to specification. Addressing these specific items before purchase will give a clearer indication of the car’s immediate roadworthiness and the likely cost of remedial work.