2012 Hyundai I40 1.6L Petrol · SD12 DWP

The 2012 Hyundai i40 presents a deteriorating mechanical profile, with a maintenance trend that has worsened significantly since 2021. In the October 2025 test at 96,463 miles, the tester flagged four distinct advisories, indicating a lapse in preventative upkeep. The vehicle passed, but the emergence of a corroded nearside front coil spring and a minor front exhaust gas leak points to environmental degradation and neglected underbody condition. A persistently insecure battery also suggests basic compartment checks were ignored. This is a worsening trend, shifting from zero defects in 2021 to multiple corrosion and component concerns in 2025. Covering roughly 6,890 miles annually, the i40 has seen exceptionally light use for a 14-year-old vehicle. The mileage accumulation is consistent, jumping 10,751 miles between October 2024 and October 2025, following a similar 6,857-mile increase the year prior. Such low annual mileage often implies long periods of standing, which directly explains the perishing observed on the nearside rear tyre across three consecutive tests. Short, infrequent trips also prevent the exhaust system from reaching optimal operating temperatures, contributing to the condensation and corrosion that likely caused the minor gas leak flagged in 2025. Inspect the underbody and suspension components thoroughly before purchase. The corrosion noted on the nearside front coil spring in the 2025 test at 96,463 miles raises immediate concerns about the structural integrity of the opposite spring and the condition of the top mounts. The tester also flagged corroded rear brake pipes in 2022 at 74,845 miles; a close examination of the entire braking system is required to determine if this surface corrosion has progressed into pitting or fluid seepage. The recurring perishing and cracking of the nearside rear tyre, noted in 2023, 2024, and 2025, indicates this wheel consistently sits in a damp or static spot, meaning the tyre rubber requires immediate replacement regardless of remaining tread depth. Check the front exhaust flexi-pipe and flanges for soot staining to assess the severity of the minor gas leak.