No, I disagree with that, (excluding Florida/Arizona, I don't know for there), seeing as theirs often issues with oil flow anyway (with OEM bearings anyway), the last thing you want to do is go for a thicker cold grade rated oil, perhaps over 15-20C it doesn't make much difference, but around about freezing it certainly will.
What data are you referring to when you say it's ok at 0+C?
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