Rad change.
 

If I change out my Rad for a new Dewitts, how much coolant do I need.
I'm not going to flush the whole system just drain rad and replace and refill with new coolant.

I would pick up 2 gals of 100% orange stuff (dex), Remember you don't want to mix the different types.

gallon of dex and a gallon of distilled water. mix 50/50 going in