2015 Mercedes-Benz SLK 2.1L Diesel · L12 PAX

The vehicle’s most recent MOT test on 2025-08-18 confirms it passed without defects, though it failed the preceding test just six days earlier on 2025-08-12—an unusual but technically compliant sequence. The pattern over the past five years remains stable, with no recurring advisories or defects beyond the single 2025 failure, which suggests either a minor oversight in scheduling or a temporary operational issue resolved before the retest. The absence of advisories in any test implies no ongoing concerns with suspension bushes, coil springs, or binding calipers, though the lack of defects does not preclude hidden wear in these areas. The 2025 failure itself is unexplained in the record, leaving no clear indication of what caused it—whether a sensor fault, minor alignment issue, or a brief component malfunction. The recorded mileage of 24,720 miles over 11 years equates to approximately 2,247 miles annually, a figure significantly lower than the UK average for a vehicle of this age. The most notable gap occurs between the 2022 and 2023 tests, where mileage jumped from 17,949 to 20,653—a 2,704-mile increase in just under a year, suggesting either a period of heavier use or a temporary storage lapse. The remaining intervals are consistent, with roughly 1,500–2,000 miles logged per year, reinforcing the impression of light usage. While low mileage generally correlates with reduced wear on consumables like brake discs and tyres, it can also indicate prolonged periods of inactivity, potentially accelerating corrosion in underbody components or suspension linkages. Given the lack of defects or advisories, the primary focus for an in-person inspection should centre on components prone to corrosion or wear despite low mileage. The SLK’s roadster construction makes it particularly vulnerable to rust in the subframe, rear trailing arms, and exhaust system, areas often overlooked in light-use vehicles. Check for uneven tyre wear, which could signal alignment drift or worn suspension bushes, even if no advisories were recorded. The 2025 failure, though unexplained, warrants scrutiny of brake systems—particularly rear calipers or master cylinder function—since binding brakes are a common but silent failure mode. Finally, verify the integrity of the electrical system, as intermittent faults can sometimes trigger MOT failures without physical defects. The absence of a service history complicates this assessment, so a thorough check of fluid levels (brake, coolant, differential) and fluid condition is essential.