Technician1
BSOD
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It depends on the design of the engine as well as the ambient temp. Here 5W30 for my new-ish Crown Victoria works the exact same as 5W40 for my old Mercedes. The number before W (winter, and it includes cold start) is what matters for the ambient temp to ensure it initially flows well from the reservoir to the engine, and the number after is what matters for everything else since the engine's operating temp range is the same whether the car is in Maine or in California, once it reaches operating temp.
It gets down to 5 degrees there in the winter?