2010 Mercedes-Benz SL 3.5L Petrol · R16 DAY

The defining mechanical story of this 2010 Mercedes-Benz SL is a chronic pattern of brake-related wear and corrosion issues, alongside a recent emissions management fault. The most recent test on 2026-06-05 returned a Pass, but only with a Minor defect noted for a partially failing centre stop lamp and advisories for perished exhaust mounting rubbers, neither of which undermines the overall result. However, the broader record reveals repeated Major defects at failed tests: in March 2024 the offside front brake pipe was flagged as excessively corroded along with both front service brakes showing excessive fluctuation, in March 2025 the engine management indicator lamp showed a malfunction, and in September 2022 an offside front coil spring fractured. These failures, combined with rear brake disc pitting advisories appearing across four consecutive tests, point to a vehicle with chronic brake deterioration and a recent powertrain control concern, even though the latest test outcome is a pass. The recurring nature of the brake and suspension defects warrants careful scrutiny rather than reassurance from the most recent pass alone. With 45,097 miles recorded over approximately 16 years, this SL averages around 2,800 miles per year, which is low for the model and its age. The recorded test history shows a notable gap between August 2021 and March 2024, suggesting the vehicle may have covered very little road use during that interval, and the resumption of testing in 2024 coincides with the emergence of the brake pipe corrosion and brake fluctuation defects. Low annual mileage of this nature typically reduces wear on major drivetrain components but can accelerate corrosion of underbody components such as brake pipes, suspension links, and exhaust hangers, particularly on a vehicle of this age exposed to winter road salts. The pattern observed here, brake pipe corrosion, perished exhaust rubbers, corroded rear shock absorber lower cups, and pitted brake discs, is consistent with the mechanical effects of a car used sparingly and stored for periods rather than driven consistently throughout the year. For a prospective buyer, the priority areas for physical inspection and test drive evaluation should be the braking system, suspension, and exhaust. The offside front brake pipe was flagged as excessively corroded in 2024, and a close visual inspection of all brake lines, particularly along the underbody and near suspension mounting points, is essential to confirm no further corrosion has developed since. Both rear brake discs were repeatedly noted as pitted or scored across 2024 and 2025, and during a test drive any pulsation through the brake pedal under firm application, or a tendency for the rear wheels to grab unevenly, would indicate the discs require replacement. The rear shock absorber lower cups were also flagged as corroded in 2025, so listen for clonking or knocking noises from the rear suspension over speed humps and uneven surfaces, and check for any visible corrosion around the lower damper mountings. The 2025 engine management lamp fault and the fractured front coil spring from 2022 should also be verified as fully resolved. Request evidence that the engine MIL issue has been diagnosed and rectified, as persistent or recurring emissions system faults on this model can relate to oxygen sensors, air mass meters, or catalytic converter efficiency, and any hesitation, rough idle, or illuminated warning light on the dashboard during a test drive would be cause for immediate concern. Although the offside front coil spring was replaced following the 2022 failure, the general age of the suspension means the nearside front spring and other bushes should be inspected for cracking or deterioration. Finally, confirm the centre stop lamp fault noted in 2026 has been rectified, and inspect the exhaust mountings for the perished rubbers flagged in the same test, as a collapsing exhaust on a Mercedes SL can cause nuisance vibration and, if it contacts underbody components, accelerate corrosion.