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You said 20W. I take that to mean a straight grade. The charts vary a bit, but 20W (Winter) - 50 should be good from roughly 0*F to well over 100*F.
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Should be good, and how the car acts are different. In past winters I've run something a little thinner, but my pan gasket is getting bad enough that I'm afraid to go any thinner, it'll leak worse...