2018 Mercedes-Benz SL 3.0L Petrol · F5 RAM

The 2018 Mercedes-Benz SL presents a largely stable maintenance profile through five consecutive MOT passes, though the most recent test on 5 January 2026 at 71,254 miles introduced a notable advisory. The tester flagged slight play in both front lower ball joints, a condition absent from the four preceding clean tests dating back to January 2022. This represents a new and potentially worsening trend rather than a long-standing defect, as the vehicle had no recorded advisories between 2022 and 2025. The car remains roadworthy, but the emergence of ball joint wear after four defect-free years suggests the front suspension is entering a phase of genuine mechanical fatigue typical of a vehicle approaching nine years of age. The mileage accumulation is consistent and unremarkable. The recorded readings climb from 38,115 miles in January 2022 to 71,254 miles in January 2026, averaging approximately 8,900 miles per year. There are no suspicious gaps or sudden jumps between annual tests, and the intervals between MOT dates remain close to twelve months throughout. This steady pattern indicates regular use rather than prolonged standing, which reduces the likelihood of deterioration caused by moisture ingress, flat-spotted tyres, or seized components from disuse. The front lower ball joint advisory on the January 2026 test warrants close attention. Ball joints are critical load-bearing pivots in the front suspension, and slight play typically stems from worn rubber boots allowing grease egress and contamination ingress. A buyer should have a technician inspect not only the ball joints themselves but also the condition of the front suspension arm bushes, coil springs, and anti-roll bar links, as these components share load paths and often degrade in tandem. Given the car's age and the absence of any prior suspension advisories, the wear pattern suggests the original factory components are now reaching the end of their service life. Beyond the flagged advisory, a pre-purchase inspection should focus on the structural integrity of the subframes and suspension mounting points, particularly around the front crossmember, as corrosion in these areas is a known concern on Mercedes-Benz SL models of this generation. The braking system, including disc thickness and caliper slide pin operation, deserves scrutiny given the mileage, along with a thorough check of the exhaust system for any emerging corrosion or leaking joints. Tyre condition and date codes should also be verified, as uneven wear could indicate alignment issues stemming from the noted ball joint play.