2004 Porsche 911 3.6L Petrol · DG 7629

The latest MOT test on 2026-05-01 resulted in a passing outcome, though it included an advisory regarding brake pipe corrosion on the nearside unit, which had previously been described as excessively corroded in the 2024-03-27 failure. This recent advisory suggests a persistent but not critical issue, as the pipe remains structurally sound and functional, though the grease or debris accumulation indicates ongoing exposure to moisture or road contaminants. Comparing this to the prior failures in 2024-03-27 and 2023-06-05, the maintenance trend appears to be stabilising rather than worsening, with the severity of the corrosion now reduced to a minor advisory rather than a major defect. The recurring near-side exhaust leak advisory from 2024-03-29 and 2024-03-27 also points to a persistent but manageable issue, likely stemming from manufacturing defects or minor fabrication flaws rather than progressive wear. The overall MOT history reflects a vehicle that has maintained roadworthiness through careful attention to critical systems, though the brake pipe and exhaust advisories warrant closer monitoring. The recorded mileage of 71,632 miles for a vehicle aged approximately 22 years represents an unusually low annual mileage of around 3,256 miles, which is far below the typical 10,000–15,000 miles per year expected for a high-performance sports car of this era. Such low mileage often suggests periods of prolonged inactivity, either due to storage conditions, owner preference, or market factors, but it also raises concerns about potential standing corrosion, particularly in the brake system and exhaust components. Extended periods without use can accelerate corrosion in exposed metal parts, especially in the brake pipes where moisture ingress is common, and may have contributed to the observed corrosion advisories. Additionally, low mileage does not inherently mean less wear on consumables like fluids, tyres, or suspension components, which still degrade over time due to age and exposure to environmental elements, such as UV degradation in tyres or fluid breakdown in hydraulic systems. For a prospective buyer, the most critical areas to inspect are the brake system and exhaust components, given the recurring advisories. Begin by visually examining the brake pipes for signs of further corrosion beyond the grease deposits noted in the MOT, particularly focusing on the nearside unit where the worst previous corrosion was recorded. Listen for any unusual noises during braking, such as grinding or squeaking, which could indicate worn brake pads, warped discs, or binding calipers. Test the brakes for responsiveness and evenness of application, as uneven braking may suggest misaligned wheels or warped discs. The exhaust system should be inspected for any additional leaks or structural damage, especially around the nearside manifold, as the minor leaks previously reported may have worsened with time. Check for excessive backpressure or unusual engine noise, which could signal a failing catalytic converter or exhaust manifold. In addition to the above, conduct a thorough physical inspection of the vehicle’s structural integrity and fluid condition. Given the vehicle’s age and low mileage, inspect the tyres for signs of sidewall cracking or perishing, which can compromise their load-bearing capacity and safety. Check the tread depth and look for uneven wear patterns that may indicate suspension or alignment issues. Verify the 12V battery health by testing its voltage when the engine is off and noting any signs of corrosion on the terminals. The battery should hold at least 12.6 volts; if not, it may require replacement, particularly if the vehicle has been stored for extended periods. Lastly, assess the condition of all fluids, including brake fluid, coolant, and engine oil, which should be replaced according to manufacturer recommendations—typically every 60,000–100,000 miles or every 2–5 years, respectively, due to their susceptibility to degradation over time. If the vehicle has a service history, verify that these fluid changes have been documented, as this will provide reassurance about the vehicle’s maintenance schedule. Finally, consider a professional inspection of the suspension, including the anti-roll bar linkages, for signs of excessive play or wear, as the slight play noted in the offside rear anti-roll bar linkage ball joint could progress with further use.