2013 Mercedes-Benz SL 3.5L Petrol · GS55 DJS

A pattern of under-trusted tyre wear, brake component wear, and a developing corrosion concern at the rear underbody defines the mechanical profile of this 2013 Mercedes-Benz SL. The vehicle passed its most recent MOT on 22 October 2025, but the test recorded advisories for both rear brake pipes showing corrosion coated in grease or another material. Looking back through the record, this rear brake pipe corrosion advisory has now appeared on three consecutive tests, beginning on 17 December 2021 when only the general brake pad wear was noted, recurring in November 2024 when the rear subframe mounting area was also flagged for corrosion not considered excessive, and persisting into the 2025 test. While the subframe area has not been re-flagged recently, which suggests it has not deteriorated further, the persistent pipe corrosion combined with an SL known for complex underbody layouts suggests the buyer should treat the rear brake circuit as the priority inspection area. Tyre wear advisories across all four recorded edges and brake pad thinness advisories appearing on four consecutive tests also indicate a vehicle that has been worked hard on the road, consistent with spirited driving or simply an older sports convertible being used as intended. With 95,381 miles recorded over approximately 13 years, the SL is averaging around 7,337 miles per year, which sits broadly in line with typical UK usage for a luxury grand tourer of this era. There are no extended gaps in the MOT history that would suggest a multi-year lay-up, meaning the vehicle has remained in regular use throughout its life. This continuity is mechanically positive for a complex Mercedes convertible, as the roof mechanism, ABC suspension hydraulic system, transmission and drivetrain benefit from regular operation rather than prolonged standing. The steady annual mileage means wear items such as brake discs, pads, tyres, and suspension bushes have been consumed at a predictable rate, and there is no evidence of a sudden high-mileage period that might suggest a heavily driven second phase of life. For an SL of this vintage, the recorded mileage is reasonable and the consistent testing pattern allows a clearer picture of the vehicle's wear trajectory than would be possible with sparse history. Importantly, there are no recorded advisories relating to oil leaks, suspension component failure, or structural corrosion beyond the rear subframe area, which is encouraging given the age and complexity of the chassis. For a prospective buyer, the rear brake pipe corrosion should be the central inspection priority. On the test drive, listen for any scraping, grinding, or metallic noise from the rear wheels when the brakes are lightly applied, and feel for a soft or spongy brake pedal that may suggest the flexible rubber sections of the brake lines are perishing internally even where external corrosion is masked by grease or underseal. Inspect the rear underbody with a torch and ideally on a ramp, paying particular attention to the brake pipe runs along the rear axle, the subframe mounting points where corrosion was previously noted, and the flexible hoses at the rear calipers for any cracking or swelling under pressure. The repeated rear brake pad wear advisories across multiple tests suggest the handbrake mechanism and rear caliper sliding pins should also be checked for seizure, which on an SL can manifest as the rear brakes dragging or pulling asymmetrically under light braking. While the front brake pads were only flagged once, an inspection of front disc wear, lipping, and pad thickness is worthwhile given the cumulative mileage. The persistent tyre edge wear advisories across all four recorded test entries point to an underlying geometry or suspension geometry issue that a buyer should investigate before committing. On the test drive, listen for any clonking or knocking from the front suspension over uneven roads, which could indicate worn lower control arm bushes or anti-roll bar drop links, both common wear items on the SL's ABC-linked suspension. Feel for any steering wander, pull to one side under braking, or vibration through the wheel, particularly as the advisory specifically mentioned inner edge wear on the front tyres, which on a rear-wheel-drive SL often points to either negative camber from worn suspension components or toe misalignment from perished bushes. The windscreen damage noted as a minor in January 2024 should also be checked to confirm it has not progressed to a point where it now falls outside the driver's swept area, as this would elevate it from a minor to a failure item. Given the recurring brake and tyre advisories, budgeting for a full set of tyres, front and rear brake pads, fresh brake fluid, and a thorough inspection and possible replacement of the rear brake pipes would be prudent before relying on the vehicle for regular use.