Reply to "Call for help 1 hour North of the SanFrancisco Bay Area (Santa Rosa)"

OK, oil is in, car is ready for coolant.

The condition of the insides of the tubing didn't look too great, all a bit rusty, but still all useable, so I just hooked it all back up with new sections of rubber hose everywhere.

What's the best thing to run in my car?

I live an hour north of SanFracisco. It occasionally frosts, with a cold spell every couple years were it gets down to 15-17 degrees, where we usually get a cracked pipe or 2 on the house.

The garage is not heated, so it gets pretty cold in there, not sure if it gets cold enough to freeze water in my car though.

When I raced motorcycles, coolant wasn't allowed, so I used water and "Water Wetter" but I was always careful to run a heater in the garage to keep things from freezing.

On my car, it's time to fill it up with coolant.

I'd be fine with water and "Water Wetter", or running antifreeze and water.

What's the best water to use? I have an aluminum radiator that already has a pinhole leak that I fixed with "Stops Leaks" (I hope now that it's been empty for a while that it still works), but I want to put the correct water in the car.

I have an RO system I can dig out of storage, I can buy the different waters sold at the store, I can buy the pre-mixed 1/2&1/2 stuff, or I can buy antifreeze and add water.

I'd prefer to put whatever would cause the least amount of further damage to my already degrading radiator.