Our 2011 1200RT was leaking oil on the left side. I'm pretty sure it is the bolt to access the cam chain tensioner had loosened up, it's located right behind the throttle body. A week later the same thing happened on our 2012 1200GS. Both bikes I just took off the throttle body and tighten the bolt and all seems good now.
Has anyone else experienced this? Is this a known problem?