I use Silkolene Pro II motorcycle two stroke oil mixed at 50:1 in my saws, I use the same thing in my bikes. It's simply the best two stroke oil I've ever seen. Having been a motorcycle mechanic for years I speak from experience here, you can tell the difference in wear when you tear an engine down. I have a Husky 50 that I bought new in 1990 that still runs as good as the day I bought it and I've cut an incredible amount of firewood with it over the years, it's had a steady diet of Silkolene since it was new.
Matt in KY