Leak
I recently purchased a 200t. It was leaking also. I took it back to dealer. He took apart, put it back together and assured me it didn't leak. I brought it home, sat it on the bench with paper towel under it. 24 hours later the paper towel is saturated. I'm no mechanic, but I played with it for an hour or so until I realized it was missing one of those plastic pieces that guide the chain into the cluth. I swear it wasn't there. I replaced it with one from another Stihl and it stopped the leaking. I don't know why, it don't make sense to me, but it stopped.