Chainsaw Repair

I'll try to shim the idle adjustment screw, maybe that's the problem. I'm still without power fromthe snow storm, so it'll be a couple of days more.  While I'm waiting, what's the most obvious cause of bar oil leaking out from beneath the bar nuts area, when the saw is sitting after running, quite a lot, maybe a slick the size of a dinner plate?  For a saw that's been a pain in the butt lately, it still cuts like crazy.  went from that to my Husky 272, and the 272 felt like a toy
Mike