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 - Sunday Drives - by Cowboy. Summer was finally upon us here in Northern Maine. We have two types of industry up here, one being "Forestry" (Wood Products) and the other "Farming" (Potatoes). There is no shortage of farm tractors and equipment around here! I have been restoring old Farm Tractors for the past 6 years, and have found it easier and less expensive to hit all the auctions and purchase whole tractors for parts needed. My wife who works at a local school, and only has weekends and summers off, while on t
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