2013 BMW 520 2.0L Diesel · RF13 ABZ

A recurring pattern of oil leakage and rear brake disc wear dominates the mechanical history of this 2013 BMW 520, with these advisories appearing across multiple consecutive tests and indicating components that have been gradually deteriorating rather than being resolved between examinations. The most recent test on 31 October 2024 recorded an oil leak classed as not excessive, the same classification applied at the October 2022 test, demonstrating that the seepage has persisted for at least two years without progression to a more serious defect. The earlier October 2022 visit produced a failure for an inoperative nearside stop lamp, alongside identical oil leak and rear brake disc advisories, while the November 2023 test added worn rear tyres on both sides and a nearside rear nail in another rear tyre, suggesting the rear axle consumables have been working harder than the front. Across five recorded tests since 2021, the vehicle has passed four times with one failure, but the consistency of rear-end advisories and the chronic oil leak form a clear mechanical narrative of progressive wear typical of a high-mileage executive saloon. With 176,555 miles accumulated over approximately thirteen years, this BMW averages around 13,581 miles annually, which is high for the vehicle's age class and points to substantial real-world use, predominantly likely to be motorway mileage given the model type. The mileage progression between tests suggests consistent rather than sporadic use, with no extended gaps in the testing record that would indicate a period off the road. High annual accumulation rates of this nature accelerate wear on components subject to thermal cycling and friction, particularly braking hardware, suspension bushes, engine oil seals, and drivetrain mountings, which aligns directly with the rear brake disc advisories and persistent engine oil leakage recorded at successive tests. The mileage bracket means that even minor advisories should be viewed against the backdrop of a powertrain that has covered considerable distance and may require more frequent preventative attention going forward. For a prospective buyer, the oil leak advisory warrants close physical inspection beneath the vehicle, ideally on a clean dry surface after the engine has been at operating temperature, checking for fresh drips from the sump, rear main seal area, valve cover gasket, or oil filter housing, all of which are common sources on this generation of BMW engines and can become expensive if left unattended. A test drive should include careful attention to any blue or grey smoke from the exhaust on startup or under hard acceleration, which would indicate oil is being burned internally rather than merely seeping externally. The rear brake discs should be inspected for lipping, scoring, or corrosion around the outer edge, and a firm press of the brake pedal at low speed should produce a smooth, even response without juddering or pulling to either side, as uneven disc wear can translate into vibration through the pedal or steering wheel under braking. The rear tyre wear pattern flagged in November 2023 is worth investigating on any prospective inspection, as edge wear on both rear tyres can suggest alignment irregularities, worn rear suspension bushes, or weakened coil springs, all of which become more likely at this mileage accumulation. On the road, listen for clonking or knocking noises from the rear axle when traversing speed bumps or rough surfaces, and pay particular attention to whether the vehicle sits level or shows any sagging at either rear corner when unladen. The nearside rear nail advisory from the same test is a routine repair matter, but combined with the other rear advisories it reinforces the need for a thorough inspection of the rear axle geometry and bushings. Finally, given the stop lamp failure recorded in October 2022, verify that all brake lights and number plate illumination function correctly during a pre-purchase walkaround, and confirm that the engine undertrays noted as obscuring components in 2022 can be removed for a proper visual inspection of the steering, suspension arms, and exhaust mounting points during any independent pre-purchase mechanical assessment.