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 - Usin Your Implements: Bucket Loader - by Curtis Von Fange. Introduction: Dad was raised during the depression years of the thirties. As a kid he worked part time on a farm in Kansas doing many of the manual chores. Some of the more successful farmers of that day had a new time saving device called a tractor. It increased the farm productivity and, in general, made life easier because more work could be done with this 'mechanical beast'. My dad dreamed that some day he would have his own tractor with every implement he could get. When he rea
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