2004 BMW Z4 2.5L Petrol · FF04 ARU

Corrosion and component wear dominate the recent testing history of this 2004 BMW Z4, presenting a distinct shift from a previously immaculate run of faultless passes. While the vehicle successfully secured a pass on 2022-05-22 with no defects recorded, the two preceding annual inspections highlight emerging structural and mechanical degradation that a prospective buyer must carefully evaluate. The trajectory moves from entirely clean test sheets straight into multiple advisories and a short-lived test failure, proving that age-related deterioration is now actively affecting the vehicle's roadworthiness despite the overall pass rate. Accumulating just 48,083 miles over its twenty-two-year lifespan results in an unusually low average of roughly 2,186 miles per year, reflecting sporadic deployment rather than heavy daily use. The testing record reveals regular annual presentations with no extended gaps or periods of dormancy that would typically trigger severe layup-related defects like seized brakes or total electrical failure. However, low-mileage usage patterns on an older performance roadster often concentrate wear onto specific metallic and rubber components that degrade through sheer age rather than high friction, meaning consumables like bushes and seals require careful visual scrutiny regardless of the low odometer reading. During the pre-purchase inspection and test drive, immediate attention must be paid to the items flagged in the 2025 MOT test, starting with the corrosion noted on both the rear shock absorbers and the rear subframe. While the tester deemed the subframe not seriously weakened at the time, surface oxidation on these BMW rear axles can progress rapidly; listen closely for any metallic clunks, knocks, or localized resonance from the rear end when driving over potholes or uneven road surfaces. Additionally, the advisories concerning worn, pitted, and scored brake discs across both the front and rear axles mean you should test the brakes firmly on a safe stretch of tarmac to check for pedal judder, uneven braking pull, or a gritty scraping sensation during deceleration. Finally, the 2025 record highlights that both front and rear brake discs require monitoring, alongside cosmetic and operational issues from that year's initial failure involving compromised headlight output and ineffective wiper blades. Though the lighting and wiper defects were promptly rectified for the retest, check that the headlamp lenses remain clear of aftermarket tint films or oxidation haze and ensure the self-levelling mechanisms operate correctly. Furthermore, note that engine, sill, and under guards partially restricted the tester's inspection in 2025, making it essential to raise the car on a ramp to properly inspect the chassis sills and underbody protection for hidden corrosion before finalizing any purchase.