Could be, but it's more likely one of your gear plugs is not quite tight.
After changing my gear oil, I was very cautious not to over tighten those plugs, turns out I under tightened them, and they leaked a little. Not even enough to affect the level, but enough to get what looked like grease on the back left side of the rim. I tightened them up a little bit more, and problem went away.
Could be that.
Same problem here Yesterday went for a ride early in the morning after I noticed the same thing. Checked my gear oil but it was up to the lip so it wasn,t comming from there, give the drain plug an extra tug to make sure it was tight wiped off the rim will check it again after the next ride I'm comming up to my first service of 1000 km. :dontknow: :read:
I have 1300 miles on my bike. I had the 600 mile service done at 950 miles (because the oil was chaged at 400 miles because it was overfilled) and the dealer changed the rear final drive oil and I am betting the drain plug is loose because there is build up around the plug. So, I am going to try to tighten it carefully and see what happens. If it's loose, I am going to call the dealer and raise hell. These frekin dealers have no clue what the hell theyr'e doing half the time. From now on I will do my own servicing.
Thanks for the input guys!!