2018 BMW 420 2.0L Diesel · TM04 AND

The most recent MOT test on 2025-09-08 resulted in a passing outcome, though it did not entirely resolve the previous year’s critical failure. The overall maintenance trend over the past three years is mixed, with two consecutive clean passes in 2023 and 2024 followed by a dangerous failure in 2024-10-01 due to a structural tyre defect on the offside rear tyre. This indicates a pattern of tyre-related issues, particularly concerning edge wear and potential internal damage, which suggests either aggressive driving habits, poor alignment, or underlying suspension irregularities contributing to uneven tyre contact. The advisories from 2023 and 2025 highlight persistent tyre wear close to legal limits, reinforcing that the vehicle’s tyre management has not been fully addressed despite passing previous tests. The recorded mileage of 58,664 miles for an eight-year-old BMW 420 reflects a moderate annual usage rate of approximately 7,333 miles, which is on the lower end for a vehicle of this age and capacity. Such mileage accumulation could imply either a more leisurely driving pattern or periods of prolonged idleness, potentially exacerbating issues like brake corrosion, suspension wear, and fluid degradation. However, the absence of significant mileage spikes between MOTs suggests that the vehicle has not been subjected to extreme wear from high-traffic or heavy-duty use. This profile is less likely to reveal severe drivetrain or suspension failures but may still expose wear-related concerns, particularly in components that degrade more slowly over time, such as seals, gaskets, and internal tyre structures. Given the tyre-related history, the prospective buyer should conduct a thorough inspection of all tyres, including the offside rear tyre that failed in 2024. Visually check for any remaining tread depth, signs of bulging or separation, and evidence of internal damage that may not be immediately visible. On a test drive, listen for unusual tyre noise, particularly from the rear, as uneven wear or structural weakness could manifest as a vibration or clunking sensation at speed. The buyer should also verify that the vehicle’s alignment and camber settings are correct, as misalignment is a common cause of edge wear and tyre failure. Impending maintenance should prioritise replacing the offside rear tyre, ideally with a new or high-quality retread, and addressing any contributing factors such as suspension misalignment or excessive camber. For the remaining components, the buyer should focus on practical checks relevant to the vehicle’s age and usage profile. Inspect the tyres for sidewall cracking or perishing, which can occur even with moderate mileage if the vehicle has been stored for extended periods without use. Check the 12V battery for signs of corrosion on terminals, swelling, or reduced cranking power, as BMWs of this age often struggle with battery degradation over time. The brake system should be examined for corrosion on discs and linings, particularly on the near-side rear where standing can accelerate rust formation, and ensure there is no binding in the calipers. Fluid levels, including brake fluid, coolant, and differential oil, should be topped up and checked for contamination or discolouration, as fluids degrade over time regardless of mileage. Finally, verify that the service book contains stamps for scheduled maintenance, such as oil changes and suspension inspections, to ensure the vehicle has not been neglected in critical areas.