2018 Mazda Cx-3 2.0L Petrol · CL52 HLL

An early pattern of corrosion is emerging on this 2018 Mazda CX-3, with the most recent MOT on 16 September 2025 passing but flagging the first signs of structural and chassis oxidation alongside a corroding brake pipe. Both rear chassis sections were noted as starting to corrode, the front and rear suspension components were likewise recorded as beginning to oxidise, and the nearside front brake pipe was specifically flagged as corroded under grease or other material. These advisories sit against an otherwise clean history, with two completely defect-free passes in March 2024 and October 2024, and only minor tyre and brake disc advisories from the earlier March 2023 test. The trajectory is therefore one of a vehicle that has been largely well-maintained but is now entering a phase where corrosion-related advisories are beginning to accumulate, and the next test should be expected to show progression if remedial work is not undertaken. With 39,856 miles recorded over roughly eight years, this CX-3 has covered an average of just under 5,000 miles annually, which is low for the age and class and points to a usage profile dominated by shorter journeys rather than sustained motorway work. This kind of mileage pattern tends to keep major drivetrain wear in check but can place its own stresses on ancillaries, particularly brake discs and pads through infrequent but repeated low-speed use, and on components such as tyres that can suffer sidewall cracking and perishing when left standing for extended periods between drives. The MOT history itself shows consistent annual testing from 2023 onwards with no multi-year gaps, so the low mileage does not appear to be the result of long-term storage but rather genuinely light ongoing use. For a prospective buyer, the corrosion advisories from the latest test are the priority items requiring physical inspection and likely preventative attention. The nearside front brake pipe should be examined closely for surface pitting or active rust bleeding through any protective coating, and it would be sensible to ask whether the pipe has been cleaned, treated, or scheduled for replacement before it progresses to a failable defect. The rear chassis and suspension corrosion advisories should be investigated with the vehicle on a ramp if possible, checking the rear chassis rails, trailing arm mounting points, and suspension arms and bushes for any flaking, bubbling under paint, or section loss. On a test drive, listen for any clonks or rattles from the suspension over uneven surfaces, particularly at the rear, as corroded bush housings and pitted arms can introduce slack that is audible before it becomes visible. Any vagueness in steering response, pulling under braking, or a soft or spongy brake pedal would also warrant immediate investigation given the brake pipe advisory. The earlier brake disc and tyre advisories from March 2023 are also worth verifying have been resolved rather than simply carried over. The front brake disc was recorded as worn, pitted, or scored, so on inspection the discs should be checked for lipping, visible grooves, and excessive run-out, with any vibration through the pedal or steering wheel under firm braking suggesting the discs still require refurbishment or replacement. The four tyre cracking and perishing advisories mean a close look at all four current tyres is essential, focusing on sidewall flex lines, bead area condition, and any small cuts or bulges; perishing of this kind tends to worsen with age regardless of remaining tread depth. Given the low annual mileage, even tyres that appear to have legal tread may be approaching the end of their service life through age-related degradation, and a budget for a fresh matching set should be factored into any offer alongside the corrosion-related preventative work.