2007 Mercedes-Benz S-Class 3.0L Diesel · SL57 FOU

The latest MOT test in April 2026 resulted in a pass, though with advisories for tyre damage and wear, indicating that while the vehicle currently meets the legal standard, there are emerging concerns that require attention. The recent history shows a mixed trend: a failure in October 2024 due to a dangerous inoperative suspension system and a major fuel leak, followed by a pass just two weeks later, suggests these issues were addressed promptly. However, the recurrence of brake-related advisories, such as the brake pedal wearing smooth and rear handbrake effort being on the limit, points to a gradual decline in the braking system’s condition. The advisories for tyre damage and wear in 2025 and 2026 further highlight that consumables are nearing the end of their service life, and the overall maintenance trend appears to be worsening without proactive intervention. At 19 years old with 79,907 miles recorded, this S-Class has averaged just over 4,200 miles per year, which is very low for its age. Such minimal usage can be as problematic as high mileage, as prolonged periods of inactivity can lead to deterioration of seals, gaskets, and rubber components, as well as corrosion in the braking and suspension systems. The low annual mileage also raises questions about the vehicle’s storage conditions and whether it has been regularly maintained to prevent issues like fluid degradation, battery drain, or tyre perishing. The gap in MOT records between 2018 and 2024 further suggests the car may have been off the road or lightly used for an extended period, which could have contributed to the suspension and fuel system failures observed in 2024. Prospective buyers should prioritise a thorough inspection of the suspension system, given the 2024 failure for an inoperative component, which could indicate worn bushes, seized links, or failing air suspension elements common in this model. Listen for clunks or knocks over rough surfaces and check for uneven tyre wear, which may signal underlying suspension or alignment issues. The braking system demands equal scrutiny: the repeated advisories for brake pedal wear and handbrake effort suggest the master cylinder, servo, or rear brake shoes may be nearing failure, so test for a firm pedal, consistent braking force, and ensure the handbrake holds securely on an incline. The tyres are a known concern, with cracking sidewalls and edges worn close to the legal limit, so inspect all tyres for age-related perishing, bulges, or uneven wear, and budget for immediate replacement if tread depth is marginal. Given the vehicle’s age and low mileage, also assess components prone to time-based degradation. Check the 12V battery health, as long periods of inactivity can shorten its lifespan, and inspect for corrosion on the terminals. Examine the underbonnet and underbody for signs of fluid leaks, particularly around the fuel system, which previously showed a major leak, and verify that all hoses and seals are intact. Calendar-based servicing is critical for a car of this age, so review the service history for timely oil changes, coolant flushes, and transmission fluid replacements. Finally, inspect the exhaust system for corrosion or leaks, and test all electrical components, as wiring and connectors can degrade over time, even with minimal use. A pre-purchase inspection by a Mercedes specialist is strongly advised to uncover any hidden issues not captured in the MOT history.