2016 SEAT Leon 2.0L Diesel · AF66 KMX

A recurring oil mist on the off‑side rear shock absorber, together with emerging corrosion on both rear suspension arms and coil springs, forms the dominant mechanical narrative for this 2016 SEAT Leon. The latest MOT on 22 August 2025 recorded a pass, yet retained advisories for the same shock‑absorber oil mist and for front‑inner tyre wear, indicating that the underlying issues have persisted without escalation to a failure but remain unresolved. Earlier in the record the vehicle suffered a series of dangerous tyre‑tread failures in August 2022 and a failed wiper performance test the same day, while the 2020 MOT highlighted an ineffective washer system and a damaged under‑tray, all of which were rectified for subsequent passes. At 116,350 miles the car averages roughly 11,600 miles per annum, a mileage rate that sits squarely within normal usage for a ten‑year‑old family hatchback. The MOT history shows annual testing without significant gaps, suggesting the vehicle has been driven consistently rather than stored for long periods. This steady kilometre accumulation means consumable wear items such as tyres, suspension bushings and shock absorbers are likely approaching the latter stages of their service life, especially given the documented corrosion and oil leakage trends. When inspecting the rear suspension, feel for any play in the lower arms and listen for clunking noises over bumps, which could signal that the corroded arm brackets are losing structural integrity. Examine the rear shock absorbers for any external oil residue and test the damping by applying pressure to the rear corners; a spongy or uneven response may confirm internal leakage. The coil springs should be checked for surface rust that could compromise spring fatigue life, and any signs of cracked paint or rust streaks on the surrounding sub‑frame should be noted. Front tyre wear, particularly the inner edge of the off‑side tyre flagged in the 2025 advisory, warrants a close visual inspection for uneven tread wear that may indicate mis‑alignment or worn steering components. Given the pattern of tyre‑tread failures, a full tyre set replacement is advisable before the next MOT, alongside a functional check of the wiper blade contact and washer nozzle spray pattern to ensure clear visibility in wet conditions. The damaged under‑tray observed in 2020 should be examined for rust penetration that could affect rear‑underbody components. Budgeting for new rear shock absorbers, potential replacement of the corroded rear suspension arms and coil springs, and a fresh set of tyres will address the most pressing safety concerns and bring the vehicle back to a more robust road‑worthiness position. A qualified mechanic’s pre‑purchase inspection focusing on these items will provide the most reliable assessment of remaining service life.