Can you use 2 cycle fuel in a 4 cycle engine?

NO!

2-cycle fuel has the oil added to it. In a 4-cycle engine, the oil is separate. If you use 2 cycle fuel in a 4 cycle engine it would be like dumping 10w-30 oil into the fuel tank of your car along with the gasoline - NOT A GOOD IDEA!
NO, NO, NO!!!!!!!!! Use only 4 cycle oil in a 4 cycle and 2 cycle mixed with the fuel in a 2 cycle. Why would you even consider doing this?