2015 Mercedes-Benz SL 3.0L Petrol · FV15 MLK

A pattern of progressive suspension wear and emerging sub‑frame corrosion dominates the recent MOT record, highlighted by a failure for a fractured nearside front coil spring in June 2026 that required immediate remedial work before the vehicle could be re‑tested and passed a day later. The same test also reiterated advisories for rear brake disc wear, rear sub‑frame surface corrosion, off‑side front tyre inner‑edge damage and slight play in both front lower suspension arm ball joints, while the 2024 and 2023 tests added front brake disc scoring and a small windscreen chip. The overall trend shows a vehicle that has remained road‑worthy but is accumulating wear on key suspension components and showing early signs of corrosion that merit close attention. With 58,397 mi recorded over roughly eleven years the average annual accumulation is about 5,300 mi, considerably below the typical UK usage rate for a car of this age. The relatively low mileage suggests the car has not been subjected to high‑stress, high‑mileage wear, yet the repeated corrosion advisories imply periods of limited use or storage that can allow moisture to affect metal surfaces. The MOT history is continuous with annual tests, so there are no unexplained gaps, but the low mileage combined with the corrosion notes means that any hidden rust on structural members may have progressed unnoticed and could affect future component longevity. Prospective buyers should give the front suspension a thorough inspection. The fractured coil spring indicates that the spring may be near the end of its service life, and the noted ball‑joint play on the lower arms can manifest as clunking noises over bumps, a vague steering wander or uneven tyre wear. Inspect the spring mounts, lower control arms and associated bushings for cracks, excessive movement or rust, and be prepared to replace the coil spring and any worn ball joints. The rear lower suspension arm corrosion, though not yet structurally weakening, should be examined for pitting that could compromise mounting points; any sign of deep rust may necessitate reinforcement or replacement of the trail arms. Brake and tyre condition also require focused scrutiny. The recurring advisory for rear brake disc wear, together with earlier front disc scoring, means the discs should be measured for remaining thickness and inspected for deep grooves that could cause pedal pulsation or reduced braking efficiency. Verify that pads are of adequate thickness and that the brake pedal feels firm without sponginess. The off‑side front tyre’s inner‑edge damage should be checked for tread depth loss or sidewall cracks, and a replacement may be prudent if the wear pattern is advanced. Finally, the small windscreen chip, while not affecting visibility, should be assessed for propagation; a professional repair or replacement will prevent future cracking. A comprehensive test‑drive focusing on brake response, steering feel and any audible clunks will help confirm whether the advisories have translated into functional issues.