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Old 08-04-2012, 10:04 AM
MJB9 MJB9 is offline
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Location: Keller, TX (DFW)
Join Date: Feb 2012
Posts: 435
Mein Auto: 2002 525i (E39)
Originally Posted by ferguscan View Post
That doesn't look like it's coming from the drain plug. More like the half shaft output above it.

My service manual has a procedue for renewing that flange seal.

Have you changed your diff oil to see how much is left in there?

Hi Ferguscan,

After more close observation, I too saw it wasn't the drain/fill plug. However, after about a month or so, it appears to have stopped leaking. I haven't checked in a month or so though. I think I'll try to add some fluid and see how much it takes to fill it and get an idea of how much it is/was empty. Perhaps I over filled it, but that's hard to do since when it drips, it's full. :-)

It could be though that it didn't like being 100% full which is probably a sign of a bad seal anyway. I haven't spent a lot of time looking into this because what I've find suggest pulling out the diff. I did find a DIY somewhere that suggested a seal replacement without pulling the diff, but that it added a lot of complexity / frustration by leaving it in?
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