2001 Mercedes C 2.1L Diesel · FB51 ADZ

Chronic corrosion and deteriorating chassis components define the mechanical profile of this vehicle. A persistent pattern of advisories since 2022 reveals ongoing issues with wheel arch rust and brake pipe corrosion, the latter of which has been repeatedly masked with grease. While the vehicle passed its latest inspection on 28 November 2025, the trend is one of gradual decline, with the emergence of structural concerns regarding the nearside rear sub-frame and coil spring. The recorded mileage of 171,844 miles is consistent with the vehicle's twenty-five year age, averaging approximately 6,874 miles per annum. This steady usage suggests that while the drivetrain has been regularly exercised, there is significant accumulated wear on all primary consumables and load-bearing components. At this mileage, the mechanical focus shifts from routine maintenance to the replacement of aging rubber mounts and the management of long-term metal fatigue. Immediate attention must be given to the braking system and chassis integrity. The repeated mention of grease on the brake pipes is a significant red flag, as this is often used to slow the progression of corrosion or hide the extent of pitting in the metal. During a physical inspection, ensure the brake lines are thoroughly cleaned to assess the actual state of the metal. Similarly, the reported corrosion on the rear sub-frame and wheel arches requires a detailed check for structural perforation rather than just surface rust. On a test drive, listen for knocks or clunks emanating from the rear suspension, which would indicate that the worn anti-roll bar bushes and corroded nearside rear coil spring have progressed beyond the advisory stage. Feel for any instability or imprecise handling during cornering, as worn sub-frame pins and bushings can lead to axle misalignment. Finally, inspect the nearside front door for the recorded damage to ensure the seal remains intact and the door operates correctly.