2004 BMW M3 3.2L Petrol · M3 UWD

The 2004 BMW M3 presents a mixed maintenance picture. The most recent test on 2 December 2025 at 115,297 miles passed cleanly with zero defects, which is a positive sign. That clean result followed a failed test just three days earlier on 29 November 2025 at 115,270 miles, where the tester flagged a supplementary restraint system warning lamp indicating a fault. The SRS fault was clearly rectified before the retest, suggesting the previous owner addressed it promptly. However, looking further back, the November 2024 test at 106,379 miles reveals a far more troubled picture. That failure listed multiple issues including excessive engine oil leakage, a corroded rear subframe, a corroded nearside rear brake pipe, worn suspension bushes, a binding offside rear caliper, and imbalanced rear brakes at 38%. Several of these defects, particularly the subframe corrosion and brake pipe corrosion, point to prolonged neglect or extended periods of inactivity rather than consistent upkeep. The mileage pattern tells a clear story of very low annual use. The car has covered roughly 5,241 miles per year over its 22-year life. Between the November 2024 test at 106,386 miles and the November 2025 test at 115,270 miles, the car accumulated approximately 8,884 miles in a single year. That is a notable spike compared to the long-term average and suggests either a change in ownership or a sudden increase in use after a period of lighter running. The gap between the 2023 test at 103,530 miles and the 2024 test at 106,386 miles shows only 2,856 miles covered in roughly twelve months, reinforcing the impression that this car has spent significant time stationary. The recurring theme across the MOT record is corrosion and brake system deterioration, both classic symptoms of a car that has sat idle. The rear subframe was flagged as corroded in November 2024, and while the tester noted structural rigidity was not significantly reduced at that time, corrosion on a structural component of an M3 demands close physical inspection. The nearside rear brake pipe was corroded and covered in grease or other material, and the offside rear service brake was binding. These are not consumable wear items; they indicate moisture ingress and lack of regular use. A buyer should thoroughly inspect the rear subframe mounting points, brake lines, and calipers for ongoing corrosion, and check whether the rear subframe has been treated or repaired since the November 2024 advisory. Beyond the structural concerns, the November 2024 failure also flagged excessive engine oil leakage and a worn nearside rear suspension arm bush. Both items were presumably repaired before the 2025 pass, but a buyer should verify the source of the oil leak and inspect the engine and gearbox for fresh seepage. The SRS fault that caused the November 2025 failure also warrants attention. Airbag and restraint system faults can stem from clock spring failures, seat occupancy sensor issues, or wiring degradation, all common on cars of this age. A diagnostic scan to confirm the SRS system is fully clear and that no latent fault codes remain would be a sensible precaution before purchase.