2012 Mercedes-Benz E 3.0L Diesel · J17 GAB

A clear pattern of corrosion and front-end wear advisories has emerged over successive MOT tests on this 2012 Mercedes-Benz E-Class, with the most recent pass on 2025-08-08 reinforcing rather than resolving these concerns. Across the 2024 and 2025 tests, advisories have clustered around three areas: front wheel bearing play on both sides, front lower suspension arm inner bushes, and rear brake pipe corrosion at the flexible hose unions. The rear sub-frame has also been flagged twice for surface corrosion around the tie arm mounting areas, although it was judged not seriously weakened on both occasions. The only outright failure in the record is an isolated nearside rear tyre cut deep enough to expose the cords in 2022, which was rectified and has not recurred. The trend is broadly stable rather than deteriorating rapidly, but the accumulation of similar advisories across consecutive tests suggests progressive wear on suspension and brake hardware that warrants close attention. The recorded mileage of 126,153 miles over fourteen years equates to an average of roughly 9,000 miles annually, which is broadly typical for a vehicle of this age and consistent with regular but not exhaustive use. There are no extended gaps in the testing history or sudden mileage jumps that would indicate long periods of standing or erratic usage patterns. Mechanically, this level of use means the suspension, braking, and drivetrain components have experienced a normal service life for their age, and the advisories recorded align with what one would expect on a higher-mileage European saloon of this generation. The tyre cut failure in 2022 and the inner-edge tyre wear advisory in 2024 are both consistent with normal mileage accumulation rather than any underlying tracking or suspension geometry defect, though they still merit inspection. For a prospective buyer, the priority areas during a physical inspection are the front suspension and wheel bearings, both of which have appeared on multiple advisories. Listen for clonks or knocking from the front end over uneven surfaces, which would indicate that the lower arm inner bushes have worn beyond the advisory stage, and feel for any vagueness or rumble through the steering wheel that worsens with cornering, a classic symptom of progressing wheel bearing play. Inspect the front lower control arms closely for splits, perishing, or obvious movement in the inner bushes when the wheels are unloaded, as Mercedes E-Class W212 chassis cars are known to suffer here as the rubber hardens with age. On the test drive, pay particular attention to high-speed stability, as worn front bushes typically cause wandering and a reluctance to hold a straight line on motorways. The rear sub-frame and brake line corrosion deserve equally careful scrutiny. With the car raised or viewed from beneath, examine the sub-frame mounting points around the tie arm attachment areas for any deeper scaling, flaking, or section loss that has progressed beyond the advisory level, particularly where road salt and moisture collect. The rear brake pipes entering the flexible hoses are known corrosion trap points, and any bubbling under the paint, greenish deposits, or surface pitting at these unions should be treated as a near-term replacement item rather than a monitor-and-wait concern. Finally, check the rear tyres for uneven inner-edge wear, as this was flagged in 2024 and can indicate either rear suspension geometry issues or simply aggressive alignment settings. A thorough pre-purchase inspection by a specialist familiar with Mercedes W212 undercarriage corrosion patterns is strongly advisable before committing to purchase.