Quote:
Originally Posted by ddeflyer
Going to a 5w-20 would yield little if any benefit on track while detrimenting your cold start wear. It is the second number that will help when the car is running hot while the first is about thickness at cooler temperatures.
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In TN, I wouldn't even be worried about cold start wear.
For the cold cranking viscosity test, a 0W is tested at -35C for and a 5W is tested at -30C.
http://www.pqiamerica.com/coldcrank.htm
One advantage that a 5W will have over a 0W within the same grade is that it is a more stable oil since it will contain less viscosity modifers (and more stable oil pressure as the oil is used). If you compare Red Line, their 0W oils contain some viscosity modifiers while their 5W oils contain none.