I have a new (less-than year-old under 20 hours) Stihl MS260 Pro chain saw that seems to be over-lubricating, and or may be some how mixing fuel with the lube. I had a hard time cutting the otherday and decided that the blade may be dull (I did just loan it to a friend) like it hit the dirt. So I cleaned everything spotless changed the blade and ran it up close to a board. It is spraying lube oil, but it also seems to be dripping lube oil from somewhere near the rear chain sprocket. Also the lube oil is dark like the gas/oil mix is in it? I don't recall this happening with my last 260pro I had for 4 years. Anythoughts.