2004 Mazda RX8 1.3L Petrol · MB04 KZG

The 2004 Mazda RX8 presents a mixed roadworthiness picture. The most recent MOT, conducted on 13 April 2024 at 29,990 miles, passed but flagged two notable defects: an offside rear coil spring suffering from corrosion and a service brake efficiency reading that only just met the minimum standard, with the tester noting the braking system likely requires adjustment or repair. This represents a clear deterioration from the four preceding clean passes between 2018 and 2021, suggesting a worsening trend in the last two years after a long period of apparently trouble-free maintenance. The mileage profile is notably low for a vehicle of this age. Covering just 29,990 miles over roughly 22 years equates to approximately 1,363 miles annually, well below the UK average. The record shows steady but modest use through the mid-2010s, with 25,522 miles recorded in May 2018 and 26,454 miles by May 2019, then a more pronounced gap to 27,604 miles in November 2020 and 28,800 miles in November 2021. The jump from November 2021 to April 2024 accounts for 1,190 miles over two and a half years, indicating the car has seen very light recent use or possibly stood idle for extended periods. Prolonged sitting is a known concern for rotary-engined vehicles like the RX8, as the Mazda 13B-MSP engine is particularly susceptible to carbon buildup, apex seal degradation, and fuel flooding when not driven regularly. A prospective buyer should prioritise a thorough inspection of the suspension and braking components. The corroded offside rear coil spring flagged in April 2024 is a structural concern that warrants close examination, as spring corrosion can compromise load-bearing integrity and handling stability. The near-fail brake efficiency reading points to potential issues with binding calipers, worn brake discs, or deteriorated brake lines, all of which demand a road test and physical inspection. Beyond the MOT record, the RX8's rotary engine requires specialist attention. Low-mileage, infrequently driven examples are prone to compression loss, oil flooding, and coolant seal failure. A compression test is essential before purchase. The exhaust system and underbody should also be checked for corrosion, particularly given the car's age and the possibility of long stationary periods accelerating rust in the sills, subframe, and exhaust components.