Basic Viscosity Question

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223
Location
Sunnyvale, CA
I searched, but I'm still confused. 0w-30 I think its agreed that the 30 is the viscosity measured at 100 degrees C. Does the 0w refer to the viscosity at 0 degress celcius? OR Does it refer to the oil's ability to "pour" or "flow" at cold temps? Or am I completely wrong? I've heard both explanations... Please enlighten me.
 
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