2021 Mercedes-Benz C 300 AMG Line ED Prem D A 1.9L Diesel · SN21 WLB

A generally clean MOT record, punctuated only by two advisories in the 2025 test, defines the mechanical story of this 2021 Mercedes‑Benz C 300 AMG Line. The most recent inspection on 25 May 2026 passed without any recorded defects, confirming that no new failures have emerged since the earlier advisories for near‑side rear tyre damage and slight play in the near‑side front suspension‑arm ball joint. At 42,913 mi the vehicle averages roughly 8,600 mi per year, a mileage rate that sits comfortably within normal usage for a five‑year‑old executive sedan. The three MOTs are spaced at roughly twelve‑month intervals, indicating no prolonged periods of inactivity that might have hidden latent corrosion or fluid degradation. This level of cumulative distance suggests that wear‑items such as brake pads, clutch components and tyre tread will be approaching mid‑life, but it does not, by itself, imply premature failure of major power‑train elements. The tyre advisory points to early cracking or perishing of the near‑side rear tyre, a condition that can progress to tread separation if left unchecked. A visual inspection should look for sidewall bulges, exposed cords or uneven wear patterns, and a road test should be sensitive to vibration or a thudding sensation at higher speeds, especially when cornering. The suspension‑arm ball‑joint advisory indicates slight play, which may manifest as a subtle clunk when traversing bumps, a vague looseness in the steering feel, or uneven front‑tyre wear. A thorough check of the ball‑joint for excessive movement and a test‑drive that includes slow‑speed “figure‑eight” manoeuvres will help confirm whether the play remains within acceptable limits or requires replacement. Given the clean overall MOT history, the primary focus for a prospective buyer should be the condition of the rear tyre and the front suspension arm. Replacing the affected tyre and having a qualified technician assess the ball‑joint for wear—potentially fitting a new joint or adjusting the suspension geometry—will address the only recorded concerns. With those items rectified, the car presents a road‑worthy platform consistent with its age and mileage, but a comprehensive pre‑purchase inspection remains advisable to verify the state of wear‑items not covered by the MOT record.