2009 Mercedes SL 3.5L Petrol · S 666

The most recent MOT test on 2026-01-22 resulted in a passing outcome, though it included several advisories that have persisted across multiple inspections, indicating a pattern rather than a sudden deterioration. The near-side front track rod end ball joint and offside front suspension arm ball joint have each been flagged with slight play and severe dust cover deterioration, which suggests ongoing wear in these critical suspension components. While the latest test did not classify these as failures, the recurrence of these advisories over the past year—particularly the ball joint issues—signifies a trend that warrants closer attention. The front wiper failure from the same test also highlights a recurring issue that should be addressed promptly to avoid further compliance risks. Overall, the maintenance trend appears stable in terms of passing MOTs but is underpinned by persistent mechanical advisories that could escalate if not managed. The vehicle’s recorded mileage of 109,022 miles at 17 years old represents a moderate annual usage rate of approximately 6,413 miles per year, which is within the expected range for a car of this age. Lower mileage might suggest periods of inactivity or lighter use, but the consistent accumulation of around 6,400 miles annually implies regular, albeit not extreme, driving conditions. However, the presence of a major fault in the supplementary restraint system (SRS) during the 2025-02-10 MOT—alongside the structural tyre damage—points to potential underlying issues that could have arisen from either aggressive driving or prolonged exposure to harsh conditions. The offside rear tyre cut and the near-side front track rod end ball joint play suggest that the suspension and tyre systems have experienced wear beyond typical mileage-based expectations, warranting a deeper inspection of alignment, wheel bearings, and tyre compound integrity. For the prospective buyer, the most critical immediate actions should focus on the suspension and braking systems, given the recurring advisories. Inspect the front track rod ends and suspension arms for further play or binding, particularly on the near-side and offside, as these could lead to uneven tyre wear, steering instability, or even a loss of control if left unresolved. Listen for clunking noises from the front suspension during cornering or over bumps, and check for uneven tyre wear patterns that may indicate misalignment or worn bushings. The front brake discs, already showing pitting and scoring, should be closely monitored for further thinning or cracking, as this could compromise braking performance. A test drive should include braking tests at varying speeds to detect any shuddering, vibration, or reduced stopping distances, which may signal warped discs or worn brake pads. Additionally, verify that the SRS warning lamp is clear of faults and that all airbags are functional, as the previous major failure indicates a potential need for professional diagnostics. Beyond the immediate concerns, the buyer should conduct a comprehensive physical inspection of the vehicle’s structural and fluid-based components. Given the vehicle’s age and the recorded tyre damage, examine the tyres for signs of sidewall perishing or cracking, which can weaken the tyre structure and compromise safety. Check the battery terminals for corrosion and ensure the 12V system is functioning correctly, as older vehicles of this age are prone to battery failure from prolonged inactivity or degraded electrolyte. Inspect the exhaust system for leaks or excessive noise, which could indicate catalytic converter or manifold issues, and verify that the engine oil and coolant levels are topped up, as fluid degradation from age or lack of servicing can accelerate wear. Finally, review the service history for the last scheduled fluid changes, particularly the brake fluid, which should be replaced every two years or 60,000 miles to prevent contamination and corrosion of brake components. If no service records are available, consider a professional fluid flush to ensure the braking and cooling systems remain effective.