Hot or cold climate, I do a 50/50 mix of water and antifreeze, replacing it every 2-3 years. I start out at a 5 gallon capacity and bring the rest with me adding some every few days until I see an antifreeze puddle under the car after a run. That means I had too much in there. Of course, all of this depends on the condition of your radiator, black, thermostats, and driving conditions ........