I would advise against 5w50 in the winter. It's much thicker than 5w30 and won't flow as well. Generally, thicker oils mean lower gas mileage. People use them for higher mileage engines sometimes in an effort to reduce oil consumption.
I have two 70s cars that call for 20w50...there's a reason. Manufacturing tolerances in newer cars give tighter clearances where thinner oil can flow.
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