2008 Mercedes CLS 3.0L Diesel · CL55 STU

The Mercedes CLS has demonstrated a stable roadworthiness trend over the past five MOT cycles, with the most recent test on 2026-05-06 at 123,899 miles confirming a pass despite a single advisory for corrosion on the near-side rear brake pipe. This is the first defect recorded in the history, suggesting the vehicle has otherwise remained compliant with DVSA standards. The advisory, while minor, indicates potential neglect in brake system maintenance—grease or foreign material on the pipe could mask underlying corrosion or improper sealing. No major recurring faults appear, but the isolated warning warrants immediate verification during an in-person inspection. Mileage progression suggests consistent use without extreme wear patterns. The vehicle has accumulated roughly 6,883 miles annually over its lifetime, a rate typical for its age. There are no significant gaps in service intervals, though the 2022-2023 period saw a slower increase—from 107,202 to 110,170 miles—before resuming a steadier pace. This minor deceleration could reflect seasonal use or temporary storage, but it does not imply prolonged neglect. The most recent 3,199 miles since the May 2026 MOT are well within the 12-month test window, ensuring the current test remains valid. A buyer should prioritise a thorough examination of the brake system, particularly the near-side rear brake pipe and surrounding components. The 2026 advisory suggests checking for corrosion on the pipe itself, as well as the condition of the brake calipers, pads, and discs—binding or uneven wear could indicate earlier issues. Suspension integrity should also be assessed, as Mercedes CLS models of this era are prone to worn suspension bushes and coil springs, especially after 120,000 miles. Structural corrosion, particularly around wheel arches and sills, should be inspected for signs of rust penetration, which could compromise wheel bearing seals or body panels. Finally, the exhaust system and emissions should be verified, as catalytic converter failure is a common failure point in this model range.