2016 BMW 520 2.0L Diesel · RO16 BZG

The most recent MOT test for this 2016 BMW 520 occurred on 2021-11-10, where the vehicle was declared roadworthy with no defects recorded. However, a critical failure was noted in the previous MOT on 2019-05-07, where the test recorded an excessive oil leak from the engine (category 8.4.1 (a) (i)), which is a serious advisory that must be addressed promptly. This failure stands out as a single, isolated incident in a history that otherwise shows consistent MOT passes, suggesting that while the vehicle has maintained a stable maintenance profile up to that point, the oil leak issue represents a significant mechanical concern that has not been resolved. The fact that this failure was not repeated in subsequent tests implies either a temporary or transient cause, but the persistent nature of oil loss is a red flag that demands immediate investigation to prevent catastrophic engine damage from prolonged fluid starvation or carbon buildup. The recorded mileage of 112,119 miles for a vehicle of this age—approximately 11,212 miles per year—falls within the expected range for a BMW of this model and era, particularly if the vehicle has been driven under typical conditions. However, the absence of significant mileage gaps suggests either steady use or periods of prolonged idleness, which can accelerate wear in certain components. For instance, standing for extended periods may lead to brake disc corrosion, binding calipers, or fluid degradation in the cooling and hydraulic systems, while consistent driving could result in more pronounced wear on suspension bushes, coil springs, and exhaust components. The annual mileage rate does not indicate rapid deterioration but does warrant careful attention to consumable items like oil, coolant, and brake fluids, which degrade over time regardless of mileage. Given the oil leak advisory from the 2019 MOT, the prospective buyer should commence an immediate inspection of the engine bay for visual signs of oil contamination on the cam cover, valve cover, or oil filter housing gasket. The symptoms of an active oil leak may include a noticeable oil residue around the engine’s front and rear, a distinct oil smell in the cabin, or a loss of power that could manifest as hesitation or reduced acceleration. On a test drive, listen for any unusual engine noises, such as knocking or ticking, which may indicate internal oil starvation or carbon deposits. The buyer should also verify the oil level and condition, ensuring it is within specification and free of metallic particles or sludge. If the leak persists, the gasket or seal must be replaced, and the engine’s internal condition should be assessed for signs of wear or damage, as oil loss can exacerbate issues like piston ring failure or valve train wear. For a vehicle of this age and mileage, the buyer should conduct a comprehensive physical inspection beyond the MOT scope. Focus on the tyres, checking for sidewall cracking or perishing, which is common in older vehicles due to exposure to UV light and temperature fluctuations. Inspect the brake system for corrosion on discs and linings, particularly if the vehicle has been stationary for extended periods, as standing can cause moisture buildup leading to rust. The suspension should be examined for signs of wear on bushes, springs, and shock absorbers, with particular attention to clunking noises when driving over bumps or uneven surfaces. Additionally, the battery should be tested for voltage and corrosion on terminals, as BMWs of this era often suffer from battery degradation over time. Finally, the fluid levels—coolant, brake fluid, and transmission fluid—should be checked, with a reminder that these fluids degrade over calendar time, even if the vehicle is not driven daily. If the oil leak is resolved, a full service should be scheduled within the next 1,000 miles or three months, whichever comes first, to ensure the engine remains protected and to address any potential underlying issues.