Chainsaw Repair

Best thing to do would be to remove the bar/chain/clutch cover, clean any residual chain oil from that area, place it on some new brown cardboard, start the engine and leave it on idle and watch the oil flow and where it's coming from. If it is only coming from the feed pipe, and nowhere else, I would advise changing from the Synthetic Stihl chain oil (in the silver bottles) to a traditional stringy mineral type oil. The Stihl oil works in the opposite way to the traditional mineral oils, and is designed to be very fluid when flowing to the bar, but thickens up when agitate by the rotational action of the chain- whereas mineral oils stay thick and stringy when flowing slowly and become more runny when hot and are on the chain.

If you have a saw with a very generous flow adjustment, then Stihl oil can flow out too easily and you do get a lot of waste/leakage.

I still haven't figured it out.  I am also not sure what the "mineral type" bar oil is you are referring to.  I am not certain that I have seen that in the U.S.