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Old 08-04-2012, 10:04 AM
mjbennett9 mjbennett9 is offline
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Location: Grapevine, TX (DFW)
Join Date: Feb 2012
Posts: 356
Mein Auto: 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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