My 2006 X5 3.0i with 130K now develops a slow leak under driver's seat.

I have not removed the big cover to inspect yet.
However, I plan to cut the corroded section and replace with line from OReilly auto parts, which is metal and made in Michigan USA.

PS: the PN posted above by killcrap is for E30, E36. Might work for E53.

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1998 E39 528i 5sp MT
2006 E53 X5 3.0 6sp MT