2015 Mazda MX-5 1.8L Petrol · HX15 YBD

The 2015 Mazda MX-5 presents a mixed but broadly stable mechanical picture as of its most recent MOT on 19 March 2026 at 23,043 miles. That test passed, yet the tester flagged corrosion on all four brake discs inboard, worn rear anti-roll bar bushes on both sides, and a cracked nearside rear tyre sidewall. These are not immediate failures, but they indicate the car is entering a phase where age-related deterioration is beginning to outpace its very low mileage. The maintenance trend is neither clearly worsening nor resolving; instead, it shows a recurring cycle of minor advisories that are addressed just enough to pass, with underlying corrosion and rubber wear persisting year on year. The mileage pattern is unusually low for an eleven-year-old sports car. Between March 2023 and March 2026, the recorded mileage rose from 22,046 to 23,043, an accumulation of just 997 miles over three full years. Annual averages sit around 2,095 miles, which is well below the UK average. Such light use can preserve mechanical components but also introduces its own risks. Seals, bushes, and brake surfaces can deteriorate from age and standing rather than from wear, which aligns with the corrosion noted on the discs and the perishing tyres seen repeatedly in the record. The most persistent theme across the MOT history is tyre sidewall cracking and perishing. This appeared on both fronts in 2023, 2024, and 2025, and on the nearside rear in 2026. Combined with a nail puncture in the offside front during the 2025 failure, it suggests the tyres are original or very old replacements that have degraded through age rather than mileage. A buyer should treat all four tyres as due for replacement regardless of remaining tread depth. The 2025 failure also cited "various corrosion underneath," a broad term that warrants a close inspection of the subframes, sills, and suspension mounting points on a ramp. The March 2026 advisories on corroded brake discs and worn anti-roll bar bushes are the most mechanically significant findings in the record. Corrosion inboard on all four discs may point to pad contact surfaces sitting moisture-laden over long stationary periods, which can compromise braking efficiency and cause uneven pad deposition. The worn anti-roll bar bushes, flagged on both sides, typically manifest as knocks or vagueness over uneven surfaces. A prospective buyer should test the car over broken road surfaces, listen for front-end clunking, and have a technician measure disc thickness and bush play. The wiper blades were replaced or flagged in 2024, and the washer fluid topped up before the 2026 pass, so those consumables appear current. Overall, this MX-5 is roadworthy today, but its low-mileage lifestyle has not shielded it from the slow decay that affects rubber and steel over time.