Pablo that may explain why my new 80cc will not open up. I'm running 8 onces of Stihl oil to a gallon for break in. I read on their website that its rated to be used at 50:1 . it's a full synthetic oil also. STIHL Incorporated USA -- Products -- Accessories -- Manufacturing the World's Number One Selling Brand of Chain Saws
I'll try 40:1 and maybe there won't be oil dripping out of my pipe. Cause thats the case now.