Just as a side note to Chris' reply:
A couple of winters ago, I went out to start the Stang to find that the 'Antifreeze' had froze. I was running probably 10-20% antifreeze and the rest water. I had to wait a few days until the temps came up so that I could drain and refill with more antifreeze.
Now, I run 80/20 (water/coolant) in the summer and switch back to 50/50 in the winter just to be safe.
E
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1991 5.0 LX Coupe - 40,750 miles
331 cu. in. / Tremec 3550 / BFG Drag Radials
12.22 @ 114.31 mph - w/1.89 60'
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