mowoodchopper
Polar Bear
It is true they used to run 30 weight oil in chain saws! They key to it was as some other guys said you needed to use non detergent it stays mixed up better than normal motor oil. It was actually the cheaper oil! As far as the ratio it was any where from 16/1 to 30/1 mostly. This was way before we had the good oils we have now. You can do it with the old saws, I would not run it any of my newer saw though. I have run the older saws that called for the old motor oil, with a 32/1 mixture of normal 2cycle oil no problem. I am not saying anyone else should but I have! Everyone has there own preferences!