2018 Mercedes-Benz C 2.1L Diesel · CF18 RVE

A suspension component failure during the 2023 test is the most significant mechanical event in this vehicle's recorded history, and it remains the focal point of any roadworthiness assessment. On 27 July 2023, the Mercedes-Benz C-Class was presented for test and recorded a Major defect for excessive play in the offside front spring control arm ball joint, resulting in an immediate failure. The same inspection noted that both front brake discs were worn but not excessively, both front tyres were worn close to the legal limit on their edges, and the rear brake discs were similarly worn. A re-test was conducted later the same day and the vehicle passed, but only after the suspension arm ball joint had been addressed. Since that event, the two subsequent tests on 19 July 2021 and 28 August 2025 have passed with no defects recorded, save for a single advisory in 2024 regarding both front tyres being worn close to the legal limit at 1.9 mm in the centre. The most recent pass represents a stable outcome following the 2023 rectification, though the suspension ball joint replacement is the single component that has demonstrated genuine wear within the recorded period. The vehicle's usage profile, at 86,231 miles over eight years, equates to approximately 10,800 miles per year, which is broadly typical for a car of this age and segment. There are no notable gaps in the testing history to suggest prolonged periods off the road, and the mileage accumulation appears steady across the recorded tests. This level of use is sufficient to generate normal wear on consumables such as tyres, brake pads, and brake discs, and it provides a reasonable basis for the advisories that have appeared. The lack of extended standing periods means the vehicle is unlikely to have suffered the typical issues associated with long-term storage, such as seized brakes or deteriorated rubber components, though this cannot be confirmed from MOT data alone. For a prospective buyer, the primary area of attention should be the front suspension, particularly the offside front spring control arm and its ball joint, which has been documented as having excessive play. On a test drive, listen for any knocking or clunking from the front end when traversing speed bumps, potholes, or uneven surfaces, as this can indicate renewed wear in the control arm bush or ball joint. With the engine off and the vehicle raised, it is worth having a technician manually check for vertical or horizontal play in the front suspension arms. Given the documented history of front tyre edge wear in 2023 and 2024, the current set of front tyres should be inspected for uneven shoulder wear, which can point to misalignment, worn suspension bushes, or compromised damping. A steering pull to one side or inconsistent self-centring would warrant further investigation into the front suspension geometry. The brake system also warrants close physical examination. The 2022 advisory noted rear brake pads wearing thin, and the 2023 test recorded both front and rear brake discs as worn but not excessively at that point. With several years of additional use since, the discs should be checked for lipping at the outer edge, any signs of scoring or corrosion, and the pads measured for remaining material. On the road, any judder through the brake pedal, vibration under heavy braking, or a grinding sensation would suggest disc wear has progressed beyond serviceable limits. Given the vehicle's age and mileage, a general inspection of the underbody for any corrosion on brake pipes, the subframe, and suspension mounting points is advisable, as these areas can deteriorate on a car that has seen regular winter road use over eight years.