2018 Mazda CX-5 2.2L Diesel · ST18 ASO

The most recent MOT inspection on 14 August 2025 resulted in a pass, but the advisory history indicates a worsening trend regarding tyre maintenance and wear. While the vehicle has consistently passed its annual tests, the frequency and nature of the advisories suggest a reactive rather than proactive approach to consumable replacement. The transition from general tyre perishing and brake wear in earlier years to specific, uneven tread wear and near-limit measurements in the most recent tests indicates that components are being run close to their legal limits before being addressed. Of particular concern is the 2024 failure for excessive exhaust smoke, which was classified as a dangerous defect. Although this was rectified to achieve a pass, it signals a period of significant engine or exhaust system irregularity that warrants close scrutiny. With 103,121 miles recorded over approximately eight years, this Mazda CX-5 has covered an average of nearly 13,000 miles per year. This is considered relatively high usage for a passenger vehicle of this age, suggesting it has been used regularly for commuting or long-distance travel rather than sitting idle. While consistent usage can often prevent issues like brake binding or battery discharge, the higher mileage naturally accelerates the wear and tear on mechanical components such as suspension bushes, coil springs, and drivetrain elements. The cumulative mileage means that major service intervals and significant component replacements, such as timing chains or turbocharger inspections if applicable, should be verified against the service history to ensure the vehicle has not been neglected during its high-mileage life. A prospective buyer should pay close attention to the tyre condition and wheel alignment. The repeated advisories for uneven tread wear on the inner edges of both front and rear tyres are a strong indicator of potential suspension or steering geometry issues. During a test drive, listen for any knocking or clunking sounds from the suspension, especially when traversing uneven surfaces, which could indicate worn bushings or dampers. Furthermore, the uneven wear suggests that the tracking or camber settings may be out of specification. You should also inspect the tyres for any signs of sidewall cracking or perishing, as noted in previous years, and ensure that the current set is not merely nearing the legal limit but is structurally sound and correctly inflated. Given the 2024 failure regarding excessive exhaust emissions, a thorough inspection of the engine's performance is essential. During the test drive, observe the vehicle for any hesitation, loss of power, or visible smoke from the tailpipe under acceleration, which could indicate issues with fuel injectors, the EGR valve, or the diesel particulate filter if it is a diesel variant. Additionally, because the 2021 records highlighted worn brake discs and thinning pads, check the braking system for any shuddering under deceleration or a pulling sensation to the side, which could signal warped discs or sticking calipers. Finally, verify that the service book contains regular oil and filter changes, as high-mileage engines are particularly sensitive to oil degradation and sludge buildup.