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Ford recommended 20w for winter and 40 w for summer
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Winter is a subjective term, depends on the particular region one lives in. When I think of winter I think of down to -30F or -40F.
According to:
https://www.usclimatedata.com/climat...tates/usmi0220
It doesn't even normally get down to 10°F in Dearborn in the winter, so 20W is fine if one lives in that region.