If it scored on the exhaust side it could be carbon build up from a rich mix or from the spark arrester being clogged. On the intake side it's usually a lean mix and that can happen on the exhaust side too. Bad seals or a poor head to crankcase seal can cause leaning but it's usually some guy leaning it out so she "screams". Bad or dirty air cleaners can cause leaning or a rich condition depending on what you have. There are likely a few other reasons too.
IME any name brand oil, Stihl, Husky, Jred, Dolmar, Echo, will give good results if mixed properly and with correct carb settings when used with decent gas. Alcohol and oil don't mix well as a general rule, so I run 40ish -1 rather than 50-1.
If the saw is in otherwise decent shape, a piston or piston and jug may be worth it. Look around at what a replacement would cost and then decide.
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Today's Featured Article - Show Coverage: Godfrey, Illinois Country Days - by Cindy Ladage. Except for last fourth of July's Old Gold show in Springfield, Illinois, I don't remember when it was so hot. Nevertheless, the heat didn't keep vendors and visitors alike from enjoying the third annual Country Day's Event. Jane Elliott said the event was originally a one man show. "Barry Seiler, owner of Country Town Farm Supply store used to invite people up to the Johne Deere store. He would give hats and a free meal for everyone that brings a tractor." Elliott said while this
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