2004 Mazda MX-5 1.6L Petrol · FG04 WVX

Structural corrosion and recurring component wear form the defining mechanical narrative of this two-decade-old roadster, tempered by a successful test outcome on August 17, 2026, which recorded a light misting of oil on the offside rear shock absorber. Reviewing the historical data reveals a pattern of structural and subframe degradation, highlighted by advisories in 2024 noting corrosion to both the nearside and offside rear inner integral body structures and sills, alongside 2025 alerts regarding corrosion on both the front and rear subframe mounting prescribed areas and all arms, plus a minor exhaust gas leak from the front exhaust system. Earlier tests also show minor consumable wear, including thin rear brake pads and a tyre worn close to the legal limit in 2012, along with a mirror-related failure in 2016 that was promptly rectified. Accumulating a total of 64,758 miles over its roughly twenty-two-year lifespan translates to an average of approximately 2,944 miles driven per year, positioning this vehicle as a low-mileage example for its age. The testing timeline shows significant reporting gaps, notably between late 2016 and late 2024, indicating periods where the vehicle may have been laid up or used infrequently. While lower mileage can limit the overall wear on certain drivetrain components, intermittent use combined with prolonged storage can accelerate localized issues such as rust formation on unpainted underbody components and the hardening or perishing of rubber bushes and dust covers, as previously seen with an anti-roll bar linkage dust cover in 2013. Prospective buyers must prioritize a comprehensive ramp inspection to assess the extent of the corrosion flagged on the sills, rear inner integral body structures, and both front and rear subframes. Check the chassis legs, floor pans, and wheel arches thoroughly for rust penetration, as MX-5 models of this era are notoriously prone to structural degradation in these specific zones. Furthermore, inspect the exhaust system for the minor gas leak noted in recent tests and verify the condition of the offside rear shock absorber to determine if the reported oil misting has progressed to active leaking or requires replacement. During the static checks and test drive, pay close attention to the suspension and handling dynamics, listening for any knocks, clunks, or excessive body roll over uneven road surfaces that would indicate worn dampers, subframe mountings, or suspension arm bushes. Test the brakes for prompt engagement and ensure there is no pulling or juddering, keeping in mind the historical note regarding thin pads. Finally, verify the operation of all exterior mirrors, check the windscreen for any reported chips in the driver's primary field of vision, and ensure that the low annual mileage and historical storage gaps have not resulted in sticky calipers or deteriorated rubber components.