I plan to replace the axle seals x 2.

Re O-rings x 2 (1 in the front diff, 1 in the RH carrier)...
Should I leave them alone?
I hardly ever hear a leak from these 2 O-rings.

PS: helped a friend replace the 2004 X3 E83 Front Diff
a few years ago, and I am trying to avoid removing th
Front Diff.

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