I have a 2006 R1200RT with about 13,000 miles on it. I am the third owner. I have changed the oil/filter and serviced the bike regularly. Lately, after sitting in the garage for about ten days or so, several drops of oil appear on the floor underneath the bike. The oil is not coming from the drain plug or the filter. It is coming from the rear of the engine and appears to be dripping down the back side of the engine where the clutch housing connects to the engine. The sight glass shows the oil level as full, and I haven't had to add any oil between changes. Interestingly, when I ride the bike every couple of days or so no oil drops appear on the floor. Right now this only happens when the bike sits for 10 days or more.
Is this common?
Is there there anything I can do to stop the dripping? A particular type of oil? (I currently use 20w-50.)
Should I just not worry about it less/until it gets worse?