2009 Mazda MX-5 1.8L Petrol · RO53 REM

The most recent MOT, conducted on 27 June 2026, was passed but carried two advisories noting corrosion to both the front and rear sub‑frames, described as not seriously weakened. The preceding year’s MOT showed the same sub‑frame advisories, while the two earlier tests in 2024 and 2023 were clean, and the 2022 test only highlighted a minor headlamp product issue. This pattern indicates a largely stable maintenance record with the only recurring concern being progressive corrosion of the sub‑frame structures, which has yet to reach a failure threshold but merits monitoring. At 94 626 miles the MX‑5 averages roughly 5 600 miles per annum over its 17‑year life, well below the typical UK usage of 8‑10 000 miles per year for a sports roadster. The low annual mileage suggests the car has spent considerable periods idle or on light duty, which can be beneficial for wear‑related components but may promote age‑related degradation such as rubber hardening, fluid breakdown and corrosion in hidden areas. There are no obvious spikes in mileage that would indicate a period of heavy use, so the wear pattern is likely to be uniform and primarily calendar‑driven rather than mileage‑driven. Given the repeated sub‑frame corrosion advisories, a prospective buyer should give the chassis a thorough visual inspection, focusing on the underside and wheel arches for any rust flaking, pitting or loss of paint. While the advisories state the corrosion is not yet structurally compromising, any progression could affect mounting points for suspension arms and lead to clunking noises over bumps or during hard cornering. On a test drive listen for any metallic creaks or rattles when applying load to the front and rear, and check that the steering feels solid with no excessive play. It is also prudent to have a qualified technician measure the thickness of the sub‑frame metal in the affected zones and assess whether remedial anti‑rust treatment or reinforcement is advisable before committing to purchase. Beyond the sub‑frame, age‑related checks are essential. Inspect the tyre sidewalls for cracking, dry rot or uneven wear, as low mileage does not preclude rubber perishing. Verify the condition of the 12‑volt battery, especially its cranking amps, since prolonged storage can lead to sulphation. Examine the brake discs for surface corrosion or glazing and ensure the calipers move freely without binding, as standing can cause pistons to seize. Finally, confirm that all major fluids—engine oil, coolant, brake fluid and gearbox oil—have been changed in accordance with Mazda’s service schedule, as fluid degradation over time can lead to reduced lubrication, overheating and corrosion of internal components. A complete service history and any recent component replacements will further reassure the buyer of the car’s mechanical soundness.