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5W viscosity is already significantly higher at 30F than 0W. My garage doesn’t get that cold, but there are many days in the winter where my car will sit outside for a while and temps will get down to 10-15F.
Just watch how the 5W-40 pours in the video at low temp. That’s too thick for cold starts.
0W for anything below 35F and 40W for track duty provides the most protection at the extremes.
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