Bill
Never a bad question.....yes I always run anti freeze through my engines (presently a Yami) makes sure no water sits in it and freezes.
You can get the kit from West Marine for around $35 a 10 gal container with hoses. Fill the container with anti freeze usually 5 gal does it, hook up the hose to your engine, you then hook up the garden hose to the y connection. start the water, when engine is running and pumping water, turn the gate value on the y connection, water stops and anti freeze starts...I do this the same time as i am Fogging. Don't forget to change the oil in the lower unit also.....I remove prop, clean and greese the slin and then cover it for the winter.
Hope it helps