2005 Mercedes C 2.1L Diesel · KB05 KMF

The vehicle remains technically roadworthy but the maintenance history reveals a worsening trend regarding structural and hydraulic degradation. While the most recent test in December 2025 at 139,159 miles passed, the presence of corroded rear sub-frames and pitted rear brake discs follows a long-term pattern of oxidation that has not been remediated. The failure of the vehicle in November 2024 due to a leaking rear brake pipe and excessive corrosion indicates that the braking system reached a critical failure point requiring immediate intervention before the subsequent pass. At 139,159 miles, the car has averaged approximately 6,600 miles per year, which is consistent with a 21-year-old luxury vehicle. The data shows steady usage between annual inspections, with only about 450 miles recorded between the November 2024 and December 2025 tests. This low annual mileage suggests the vehicle has not been subjected to high mechanical stress, but it also likely contributed to the persistent surface corrosion seen across the undercarriage components like the sub-frame and brake lines. A buyer must conduct a thorough inspection of the rear sub-frame and mounting points, as corrosion has been flagged in every test since 2022. Although the tester currently classifies these areas as not seriously weakened, the recurring nature of the advisory suggests the structural integrity is deteriorating. Specific attention should also be paid to the front suspension arm bushes, which have been noted as worn in both 2022 and 2024, indicating that these rubber components are nearing total failure. Given the history of leaking brake pipes and excessive corrosion on the hydraulic lines, the entire braking system should be checked for further weeping or thinning metal walls. The previous reports of corroded coil springs and worn shock absorber bushes further suggest the suspension geometry may be compromised. Any prospective owner should be prepared for significant maintenance costs related to rust-related repairs and suspension refurbishment to ensure the vehicle remains safe.