2009 Mercedes S-Class 3.0L Diesel · DX09 UDT

The vehicle presents a stable roadworthiness status, passing its most recent test in April 2026 at 96,479 miles with no recorded defects. The maintenance trend shows improvement following a period of noted issues in 2023. While the car failed in May 2024 due to high exhaust emissions, the subsequent passes without advisories suggest the fuel system-related issues were addressed effectively and the vehicle is currently operating within manufacturer parameters. At 17 years old, the recorded mileage of 96,479 miles averages to approximately 5,675 miles per year. The annual usage pattern appears consistent in recent years, with roughly 9,000 miles covered between May 2024 and 2025, and another 6,500 miles between May 2025 and April 2026. This low mileage often reduces wear on mechanical drivetrain components but increases the risk of rubber perishation and seal drying during long periods of inactivity. A buyer should focus their physical inspection on the braking system and rubber components given the history of component failure. The 2023 test flagged deterioration across all four brake hoses and a corroded offside front brake pipe, indicating that the hydraulic lines are reaching age-related degradation. Check for any cracking or weeping in these hoses and the valve seals. The presence of undertrays in 2024 is a positive sign for underbody protection, but the inspector should still verify the integrity of the S-Class chassis for structural rust that may be hidden behind these shields.