2012 Mercedes-Benz C 1.8L Petrol · AF12 UUS

The defining mechanical story across the six MOT tests on file for this 2012 Mercedes-Benz C-Class is a consistent pattern of rear-corrosion advisories affecting the coil springs and brake pipes, accompanied by a chronic minor oil leak that has appeared at every single test since 2021. The most recent assessment on 28 October 2024 returned a pass, but it carried forward the same rear coil spring corrosion on both sides that had been flagged in the immediate prior failure on 25 October 2024, alongside renewed advisories for worn suspension arm pins or bushes at the nearside front and offside rear. Two failures are on record within this dataset: the 2024 test was triggered by excessively worn front brake pads on both sides, while the 2023 test was failed outright due to a Major defect where the driver's door could not be opened from inside the vehicle, a serious safety-related issue. The rear brake pipe corrosion advisories have been a constant fixture since 2021, appearing on three separate tests, and the overall trend suggests a vehicle whose rear axle components are progressively degrading rather than recovering between inspections. With 279,325 miles recorded over approximately 14 years of age, this car is averaging close to 20,000 miles per year, which places it firmly in high-mileage territory for its class. The MOT history is unusually concentrated in the October to November window each year, with no significant testing gaps suggesting extended lay-up periods, and the mileage is therefore likely to represent genuine continuous use rather than a low-activity profile. High annual accumulation of this kind accelerates wear on suspension bushes, brake discs and pads, fluid-sealed drivetrain components and rubber mounts, and it provides context for why multiple suspension advisories have begun to accumulate on the same components across consecutive tests. The recurrence of advisories rather than their resolution between tests further suggests that mechanical attention has been reactive rather than restorative. For a prospective buyer, the rear brake pipe corrosion advisories are the most pressing structural concern to investigate. These pipes sit on the underbody and are notoriously vulnerable to road salt and winter grime on a vehicle that has clearly been in year-round service. On inspection, the brake pipes should be examined closely for pitting, scaling or any flaking that penetrates the metal, and the brake pedal should be tested firmly multiple times to confirm a firm, non-spongy feel. The front brake pads, which were failed on the 2024 test for excessive wear on both sides, indicate that brake service intervals should be budgeted for, and a test-drive should listen for any grinding or squeal under light braking and feel for any judder through the pedal. A binding caliper would manifest as the vehicle pulling to one side after prolonged driving or as excessive heat at a front wheel following a short journey. The rear coil spring corrosion advisories on both sides should be visually inspected for any fracture risk, particularly on the offside rear, and the suspension should be pushed down firmly at each corner to check for any knocking or clonking over uneven surfaces, which would indicate the worn suspension arm pins and bushes recorded in 2024. The chronic oil leak should be examined underneath for drips on the sump, rocker cover gasket and oil filter housing, the latter being a known wear point on this generation of Mercedes-Benz engines, and the engine bay should be inspected for fresh oil residue or misting. The 2023 Major failure regarding the driver's door internal release mechanism is also worth verifying directly by operating the interior door handle several times to confirm consistent and positive action, as door latch faults can recur. With this combination of high mileage, persistent rear underbody corrosion advisories and progressive suspension wear, any prospective purchase should be accompanied by a thorough pre-purchase inspection focused on the underbody, brakes and suspension.