I was just re-reading it myself and it is very clear that 0W grade is better than 5W and better than 10W due to less thickening when the oil cools off.
I am sold, I am going to M1 0W-40 next oil change.
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2001 Boxster S 3.6L, Zeintop
"Calling upon my years of experience, I froze at the controls." - Stirling Moss
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