If the video can be believed, this shows M1 5-30 at -40F pouring vs a standard Synthetic blend. The full synthetic performs much better at -40. Here's the link under Cld weather.
http://www.mobiloil.com/USA-English/MotorOil/Videos/Videos.aspx
http://www.mobiloil.com/USA-English/MotorOil/Videos/Videos.aspx
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