I use concentrate. Then it’s ezpz.
I look up the specs on the volume of the system (available for all cars). If it’s, say, 10qts:
- I then multiply by my desired final ratio (I use 60%) - so 6qts.
- I add 6qts to the system
- top up with distilled water.
If you do not use concentrate, you will have to be content with less than 50/50, as you are going to have up to 20% of the system still with water in it (heater core, low pointes, etc) when you start adding the pre-mix.
My brother lived in Northern IL a while, and I’ve seen -30F there when visiting him. I would not run even 50/50 there myself - I’d mix it 60/40. it buys a LOT more protection - 20% more additives for one thing, plus freeze protection down to -55F.
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