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Oil leak

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avdave:
I've noticed today an oil leak from my hub between the sprocket and the hub. The bike has been kept upright and it hasn't been in an aircraft which I know can cause leaks. I've a new chain waiting to go on and have the tools ready to reverse the sprocket but was hoping the chain would last until the next oil change which is due in August when the hub will be 3 years old. So are there any seals between the hub and sprocket which might need replacing and which might explain the leak.
Any advice will be welcome

stutho:
Hi avdave,
There is a seal between the sprocket and the hub but it can't be replaced without a specialist tool - I wouldn't recommend doing this yourself.  How much oil are we talking about?

stutho 

avdave:
Probably about 5ml or so on the floor at work yesterday when I went to leave for home.

stutho:
That is a lot.  It may be worth removing the sprocket and have a visual inspection of the seal and  a bit of a clean up.

avdave:
The bike has now been sitting in the garage for 2 days as I have been away and there has been no further sign of any oil leaking. I'm wondering if it might be linked to a ride at the weekend where a fair amount of straw got caught up around the rear sprocket. As it wasn't causing any problems riding I didn't clear it out, so different from when it would jam my derailleurs  on the old bike. When I inspected the hub after the oil leak there was still some traces of chewed up straw between the  sprocket and the hub which I cleared out so I'm wondering if it might have got past the oil seal and acted as a wick causing the  leak. I'll order some new oil and take your advice stutho and take the sprocket off for a closer inspection as it could also do with reversing soon anyway.

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