2020 BMW M135I Xdrive Auto 2.0L Petrol · SW69 JVZ

The BMW M135i xDrive presents a mixed maintenance profile. While the vehicle has consistently achieved a pass across all recorded MOTs, the most recent test on 25 November 2025 at 27,172 miles introduced notable advisories that were absent in the preceding two years. Both rear brake pipes were flagged for corrosion covered in grease or other material, and the nearside front inner brake disc was noted as worn, pitted, or scored. These are new defects emerging since the clean pass recorded on 18 February 2025 at 23,702 miles, suggesting a worsening trend in braking system condition over the final months of the record. The car remains roadworthy, but the trajectory warrants closer scrutiny. The mileage accumulation tells an unusual story for a 2020-registered hot hatch. Between the February 2025 test at 23,702 miles and the November 2025 test at 27,172 miles, the car covered 3,470 miles in just nine months, which is unremarkable. However, the broader picture is strikingly sparse. From first registration through to February 2025, the vehicle accumulated only 23,702 miles over nearly five years, averaging roughly 4,700 miles annually. Then, in the final recorded stretch, usage picked up noticeably. This pattern suggests the car may have sat largely unused for much of its early life before being driven more regularly in late 2025. Extended periods of inactivity are known to accelerate brake pipe corrosion and cause flat-spotting on tyres and discs, which aligns with the defects now appearing. The rear brake pipe corrosion flagged on both sides is the most significant finding. Corroded brake pipes covered in grease or debris can mask the true extent of metal loss, and the tester's decision to issue an advisory rather than a failure does not mean the pipes are safe long-term. Any prospective buyer should have a thorough inspection of the entire braking system, paying particular attention to the condition of all rigid and flexible brake lines, the rear calipers for binding, and the thickness and condition of the front brake discs. The pitted nearside front inner disc also demands measurement against minimum thickness specifications. Beyond the braking system, the low-mileage history raises its own concerns. Components such as suspension bushes, coil springs, and dampers can deteriorate from age and standing rather than use, so a visual check for perishing, leaks, and corrosion on the underside is advisable. The 2023 advisory for tyre wear and damage was minor and resolved, but given the car's prolonged stationary periods, a fresh inspection of all four tyres for sidewall cracking and uneven wear remains prudent. Overall, the record shows a well-maintained car that has recently developed early-stage corrosion issues consistent with underuse, and a hands-on inspection before purchase is strongly recommended.