2010 Mercedes-Benz C 1.6L Petrol · G3 OSA

A pattern of progressive rear suspension corrosion sits at the centre of this C-Class's mechanical story, with both nearside and offside rear coil springs flagged as corroded at the most recent test on 1 April 2026 and again going back to the 2023 examination. While the vehicle has passed every annual test without a recorded failure, the recurrence of the same advisory on the same axle components points to a chassis condition that is steadily worsening rather than a one-off observation. The 2023 test also recorded a minor exhaust gas leak from the rear section alongside the rear spring advisories, suggesting that corrosion is not isolated to the springs alone. The intervening clean pass in April 2025 indicates no sudden deterioration in the intervening twelve months, but the return of the spring advisories in 2026 confirms an ongoing rather than resolved issue that will likely require replacement within the next year or two. Recorded mileage of 112,283 miles over sixteen years equates to an average annual accumulation of roughly 7,018 miles, which is consistent with typical mixed private and commuter use for a car of this age. There are no significant gaps in the annual testing record, with continuous MOTs documented from 2022 through 2026, indicating the vehicle has remained in regular service throughout. The mileage progression between tests aligns broadly with this average, with no evidence of extended lay-ups that would raise concerns about seized brakes, perished rubber, or stale drivetrain fluids. This steady usage pattern is mechanically favourable in that the major consumables and suspension components have been worked regularly, reducing the likelihood of dormant corrosion or seized mechanisms, but it also means the typical wear items for a Mercedes of this age and mileage have already been exercised through their expected service life. Given the recurring rear coil spring corrosion flagged across multiple tests, particular attention should be paid to the vehicle's rear ride height and behaviour over uneven roads. On a test drive, listen for clonking or scraping noises from the rear suspension when traversing speed bumps or potholes, and observe whether the car sits level when unladen or whether one rear corner appears lower than the other. Corroded coil springs can also induce vague, wandering behaviour at higher speeds or a sense of instability during emergency lane changes, so assess the steering response and rear tracking on a dual carriageway section of road. Inspect the springs visually in the wheel arch area for surface pitting, flaking, or any sign of cracking near the lower coils, as the advisory wording suggests surface corrosion that may have progressed deeper into the spring material since 2023. The nearside front wheel bearing play recorded in 2023 warrants a focused road test, specifically listening for a humming or droning noise that varies with road speed and disappears or diminishes when cornering in one direction. A slight rotational play may still be present and could indicate the bearing is approaching the end of its service life. Additionally, check the rear exhaust section for any audible ticking or hissing, particularly on cold start, and inspect the silencer box and pipe joints for visible corrosion or weeping seams, as the 2023 advisory noted a very slight leakage that may have developed further. The nearside rear tyre worn on its inner edge noted in 2023 suggests a possible alignment or suspension geometry issue on that corner, so confirm even tyre wear across an axle on the current set and verify there is no pulling to one side under braking. Finally, examine the windscreen chip noted as a minor in 2026 to ensure it has not propagated into the driver's swept area, and be prepared to budget for replacement of both rear coil springs and a possible wheel bearing within the next twelve to eighteen months.