Dont run the engine. If gasoline has diluted the oil, you don’t have lubrication. First suspect is the float valve in the carburator. Pinhole leaks in the float allows gas to bypass and flood the crankcase. If this happens, the oil level rises above the bottom of the cylinder and pours past the piston and rings and oil is ejected.
If the pistons are not scored, you can repair this cheaply.