I fully agree that the oil weight is just a band aid, and relies on higher temps that thin out the oil and be equivalent to what a 40 weight would be with lower operating temps.
I use 15-50w as I prefer to have a thinner oil weight span for more stability. I also add Ceratec or MoS2 additive.
I am also of the believe that 10w60 is also a variable on bearing wear for street driven cars as it just flows more poorly during cold starts.
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