This is interesting.

If I were the W124 designer, and wanted the sunroof seal to be watertight, I would have used rubber softer than that on the roof of W124.



Newer cars with glass sunroof has rubber on the moving panel. Is it not water tight either?


Anyway, no matter whether the sunroof seal is watertight or not, there should be water drain. For example, it may start to rain while the sunroof is open. The driver detects raing nad closes the sunroof, but water is already in.