Can you remove it from it's mounting leaving it connected, there might be a label or some numbers etc on the back which,
might give you a clue as to what it is?
Ah yes, I forgot about the owners who never open the bonnet but, run to the stealer every time a light or message
comes up, they won't even know what a dipstick is.:rolleyes:
It's so when the tailgate is closed there is 5mm more of the seal to compress, creating a watertight seal, that's the theory,
it worked on mine, iirc it's an area either side of where the upper tailgate meets the lower one, it's in RAVE.
I remember a post of yours some time ago when, you did the timing chain on your CLK (I think it was) with a photo unless,
it was a photo of it in a dismantled state with, the person doing the job out of shot.:rolleyes: