I pulled it out of the garage again today and fired it up and let it idle for a few minutes again. No signs of any oil drips where the bike was before I moved it out, none in the driveway below where the breather is, no drips/streaks as I pulled it into the garage. I'll just have to make sure if it's going to be a couple weeks between rides to pull it out in the driveway before letting it idle so it'll dump the oil there so I can spray it with some degreaser or something to help break it up and then rinse it down the driveway with the water hose.