| You're asking "whys" on the strut seal design. I don't know, and it doesn't matter. If you have a leaking top seal, be happy that the repair costs only about $550 for both sides, vice $3200 to replace the struts entirely.
I would characterize the seal as being "replaceable" and not just "removable." There are several designs of the actual seal itself. Some leaks are caused by a fault in the seal itself; others, by cracks in the metal surrounding the seal, opening up a leak. Replacement is the answer, not solder. Best to take your car to a certified MB tech, and not to a plumber, for repair.
I don't know the system pressures, but the type of plastic used in the tubes is quite strong.
Thanks for your video - it is very helpful in assisting others to recognize the upper seal problem. Whatever the pressures, they are likely higher when the car is raised (and may be higher when the strut response is set to Sport 1 or 2).
The point is, you definitely have a leak - and it is best to get it fixed properly.
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2005 S500 4-Matic
with Gateway 500 iPod integration
1978 450SL restoration project
Formerly: 2000 S500
with Ice>Link iPod integration
Moto V710 phone with MikBox
Upgraded Voice Control
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