2014 Mercedes-Benz SLK 2.1L Diesel · ST64 AAY

The 2014 Mercedes-Benz SLK presented a current DVSA test outcome of PASS recorded on 5 November 2025, following an immediate re-test after the FAIL dated just six days prior on 30 October 2025. The close proximity of these two tests indicates that remedial work was undertaken specifically to clear the failure items. While the most recent pass is favourable, a careful review of the underlying advisory notes carried across both entries reveals a maintenance trend that is deteriorating rather than stable. Advisories relating to the front inner brake discs showing wear and pitting, the offside front suspension arm ball joint exhibiting slight play on the caster arm, and the nearside front suspension arm bush beginning to split were outstanding at the time of test. These items have carried forward from the 2024 examination, where a fractured offside rear coil spring was identified as a major failure, and a fractured nearside front coil spring and nearside rear coil spring had been recorded as major failures at the 2023 test. The recurrence of suspension component issues over consecutive annual tests suggests ongoing wear in the front suspension geometry and chassis components, which warrants close attention from a prospective buyer. With 78,913 miles recorded on a vehicle now in its twelfth year, the SLK averages approximately 6,576 miles annually, which is broadly typical for its age and broadly consistent with a vehicle used for occasional leisure or weekend driving rather than sustained daily commuting. There are no extended gaps in the MOT history that would suggest prolonged periods of standing, although the relatively modest annual mileage does mean that some age-related degradation should be expected even where mechanical wear is comparatively limited. Brake disc corrosion, caliper binding, and tyre sidewall perishing can all progress during periods of light use, and the recorded front brake disc pitting already indicates that the discs have been exposed to moisture cycling and light surface corrosion even if they have not yet reached a serviceable wear threshold. For a prospective buyer, the most pressing inspection priorities should centre on the front suspension, which has produced recurring advisories over consecutive tests. The caster arm ball joint showing slight play and the split noted on the caster arm bush are conditions that typically progress with continued use, and a test drive over uneven road surfaces should be conducted specifically to listen for clonking or knocking from the front suspension, particularly over speed humps or during full-lock low-speed manoeuvres. Any vagueness in steering response, uneven tyre wear across the front axle, or visible grease contamination around the inner ball joints would suggest that replacement of the front suspension arms is imminent. The brake disc pitting noted on the front inner faces is consistent with light surface corrosion between uses, and the discs should be inspected for run-out or shudder under braking; uneven lipping on the disc edges would indicate that disc replacement is required, particularly if accompanied by pedal vibration. Beyond the documented advisories, a physical inspection should include a careful check of all four coil springs, given that fractured springs were recorded at both the 2023 and 2024 tests on three separate corners, suggesting the vehicle may be operated on roads where salt exposure or heavy impact loading is common. The near-rear tyre was previously recorded at a dangerous tread depth, and while this would have been replaced, the matching tyres should be examined for even wear patterns and any sidewall cracking consistent with age rather than mileage, particularly as the nearside front tyre was previously noted with cracking and perishing. The full service history should be verified, with particular emphasis on brake fluid replacement on a calendar basis, coolant renewal, and the condition of the 12V battery, which on a vehicle of this age is likely to be approaching the end of its service life. Finally, given the SLK's folding hardtop mechanism, the roof operation cycle should be observed both raising and lowering to confirm smooth functioning, as hydraulic or electrical faults in this system can be disproportionately expensive to rectify on this model.