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I did the autopsy on the factory washer pump that leaks through weep hole.
It was obvious that the round seal (around the shaft) is loose (freely spinning once it is out).
The fluid leaks upwards through seal/shaft interface (RED arrow), and out via weep hole.
So, the engineers designed washer pump knew that one day this will happen lol...
All rubbers shrink with time.
Also wear/tear from the electric motor shaft spinning.
PS: The GM part posted above is made by Continental. Works perfect for cheaper price of $11.
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1998 E39 528i 5sp MT
2006 E53 X5 3.0 6sp MT
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