Cabriolet listings draw consistent questioning about the power top: whether the hydraulics have ever been serviced or replaced, whether it leaks in rain or a car wash, and the state of the plastic rear window, which gets asked about specifically when it bulges or clouds. The strongest sellers answer with video of the top cycling and a service record; the weakest answer in the corpus is a seller who could not speak to the hydraulic system at all and could only say the top worked. …
On cabriolets the hydraulic top and its rear window are the real inspection item
Mercedes-Benz CLK550 (C209) · mechanical