2016 BMW 420 2.0L Diesel · H11 OBA

The defining mechanical story of this 2016 BMW 420 is one of consistent rear brake wear surfacing as a recurring advisory, set against an otherwise clean roadworthiness record. Across four recorded MOT tests spanning late 2022 through the end of 2025, the vehicle has passed on every occasion, with the most recent test on 31 December 2025 returning no advisories or defects at all. The earlier pattern, however, shows the same advisory appearing on both the October 2022 and November 2023 tests, specifically noting rear brake pads wearing thin on both the offside and nearside rear. Because that advisory is absent from the November 2024 and December 2025 tests, the rear pads have evidently been replaced at some point between late 2023 and late 2024, and the new material has clearly lasted through the latest examination. While the absence of advisories on the two most recent tests is a favourable immediate indicator, the recurrence of the same component wearing thin across consecutive tests is the kind of history that warrants a closer physical inspection at the point of purchase. The recorded mileage of 180,739 miles over roughly ten years works out at an annual accumulation of approximately 18,074 miles, which is notably higher than typical private-car usage and points to sustained motorway or commuter work. Testing intervals have remained broadly annual with no extended gaps in the recorded history, suggesting the vehicle has been in continuous use rather than laid up for long periods. High-mileage accumulation of this nature places greater cumulative demand on the consumable items that have already featured in the advisories, namely the rear brake system, as well as on suspension bushes, coil springs, anti-roll bar links, wheel bearings, and drivetrain mounts. The continuous-use pattern also means the 12V electrical system, coolant, and automatic transmission fluid (where applicable) are likely to be approaching the upper end of their typical service intervals, even though MOT records cannot confirm or refute any specific maintenance having been carried out between tests. For a prospective buyer, the rear brake history should be the starting point of any physical inspection. Lift the car or peer through the wheels to confirm the current pad material thickness on both rear corners, and visually inspect the rear discs for lipping, scoring, or corrosion pitting, particularly around the outer edge, as the discs may have been turned or replaced alongside the pads. On a road test, listen for any graunching or metallic scraping from the rear under light braking, and feel for a pulsing or juddering pedal that would indicate warped rear discs. Given the high overall mileage, particular attention should be paid to the suspension, so push down firmly on each corner and release to check that the car rebounds cleanly without a secondary bounce, which would point to weakened dampers, and listen for clonks or knocks from the front over uneven surfaces that may indicate worn wishbone bushes, drop links, or top mounts. Under-bonnet inspection should focus on oil leaks from the valve cover gasket and oil filter housing, both of which are common failure points on higher-mileage BMW four-cylinder and six-cylinder engines of this era, and any signs of coolant staining around the expansion tank, radiator, or water pump area should be investigated. From the driver's seat, check that the auto gearbox (where fitted) shifts smoothly through all ranges without hesitation or flare between ratios, and confirm that the iDrive infotainment, climate control, and electric seat functions operate as expected, as electrical gremlins become more common with age. A diagnostic scan for stored fault codes, particularly in the DME, transmission, and ABS modules, would be prudent given the mileage, and a compression or leak-down test on the engine would provide valuable reassurance ahead of purchase.