^^^^^^ Residual water can be left in there, any water left will be thinned to a non freezable (if that's a word) state so you have no worries. My buddy has done exactly that, just draining and never using AF, for probably 15-20 years. Last summer he bought a new engine because of freeze damage. AF costs about $20 and takes 15 minutes to do--that's pretty darn cheap insurance IMO. I'll kep doing it. At least here in WI where it gets COLD as heck, maybe if I lived in FL, AZ, CA it'd be a different story.
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