2003 Mercedes-Benz SL 3.7L Petrol · RF03 YBY

The Mercedes-Benz SL presents a clean MOT history in its most recent tests, with the August 2025 inspection at 85,343 miles showing no defects—an outcome mirrored in the July 2024 and March 2022 tests. The only anomaly is the duplicate July 2023 entry, where the vehicle passed and failed on the same day at 83,622 miles, though no specific faults were recorded. This suggests either a clerical error or an unusually swift re-test without mechanical issues. Overall, the trend is stable, with no recurring advisories or failures to indicate deteriorating maintenance. The absence of defects in recent years implies either meticulous upkeep by previous owners or a vehicle that has been lightly used, though the latter is more likely given the low annual mileage. The SL’s mileage of 85,343 over 23 years averages just 3,711 miles per year, well below typical usage for a classic sports car. The gap between the March 2022 test (83,463 miles) and the next inspection in July 2023 (83,622 miles) covers a full 16 months with only 159 miles added—a stark indicator of prolonged inactivity. The subsequent 1,545 miles between July 2023 and July 2024, followed by another 1,545 miles to August 2025, reinforces the pattern of sporadic use. Such low mileage reduces wear on consumables like tyres and brakes but raises questions about potential long-term issues from neglect, such as seized bearings, degraded fluids, or corrosion in less accessible areas. Given the vehicle’s age and intermittent use, a buyer should prioritise a thorough inspection of components prone to degradation when left unused. The suspension—particularly the coil springs, anti-roll bars, and bushings—should be checked for dryness, cracking, or excessive play, as these can degrade even with minimal movement. Brakes, despite no MOT faults, warrant close examination: binding calipers, uneven disc wear, or fluid leaks may not have been caught in cursory tests. Structural integrity is another concern; the SL’s aluminium body resists rust, but hidden corrosion in the undercarriage or wheel arches could still compromise safety. Finally, verify fluid levels and condition—power steering, brake, and differential fluids—since stagnation accelerates degradation in older systems. The clean MOT record offers reassurance, but the vehicle’s history of near-stagnation demands hands-on scrutiny before purchase.