2004 BMW X5 4.4L Petrol · RN54 ABF

The most recent MOT, dated 23 September 2025, returned a pass but flagged several advisories – a minor oil leak, front brake pads approaching the minimum thickness and an exhaust that emits blue smoke under acceleration – and the earlier failure on the same day recorded an inoperative MIL warning. This pattern of passing after remedial work, yet repeatedly surfacing the same fault areas, indicates a maintenance trend that is not improving; the vehicle is being kept road‑legal but underlying mechanical issues remain unresolved. At 130,330 miles on a 2004 model the average annual distance works out at roughly 5,900 miles, which is well below the typical usage for a vehicle of this age. Such low mileage often points to long periods of inactivity or very light use, both of which can accelerate age‑related deterioration such as corrosion of chassis components, rubber hardening and fluid breakdown, even though the wear from mileage itself is modest. The relatively low wear on the drivetrain and suspension is a positive sign, but the vehicle’s age means that many wear items are likely approaching the end of their service life regardless of mileage. Prospective buyers should give particular attention to the recurring oil leak and the blue‑smoke exhaust symptom. An oil leak that is not yet excessive may be coming from a valve‑cover gasket, oil filter housing or turbo oil seal; a visual inspection should locate any fresh oil around the valve cover, turbo inlet/outlet and under the engine bay, and a test drive should be watched for oil spots on the garage floor. Blue smoke on acceleration typically signals oil entering the combustion chambers – possible causes include worn valve guides, piston ring wear or a leaking turbocharger oil seal – and should be confirmed with a diagnostic scan of the MIL fault codes, followed by a compression or leak‑down test if necessary. The front brake pads are already thin, and the brake discs have previously been noted as pitted; the buyer should measure pad thickness, feel for any pulsation or shudder when braking, and inspect the discs for scoring or excessive rust, planning for pad replacement and possibly disc resurfacing or fitting new discs. The rear stop lamp and headlamp aim issues recorded in earlier years are minor but should be verified as functional and correctly aligned before purchase. Beyond the specific defects, a vehicle of this vintage warrants a thorough age‑related inspection. Check tyre sidewalls for cracking, dry rot or loss of tread depth, and verify the DOT code to ensure the tyres are not older than six years, as ageing rubber can fail irrespective of mileage. Examine the battery for sulphation and confirm it holds charge, especially if the car has spent long periods standing. Inspect the suspension bushings, ball joints and shock absorbers for any signs of leaking fluid, cracked rubber or excessive play, and look for rust on the under‑carriage, wheel arches and door sills that could indicate water ingress during idle periods. Finally, confirm that all service stamps are present and up‑to‑date, that coolant, brake and gearbox fluids have been changed within the recommended intervals, and that the CV joint boots are intact, as deteriorated boots can allow contamination that leads to costly drivetrain repairs.