Did you know?5.3L 'Vortec' 5300 V8 with Active Fuel Management, 320 hp (239 kW).
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What I was getting at there, is 10W30 is SAE rated down to -20* and on older "high mileage" motors get some added benefit from the slightly heavier viscosity from the 10W30....as far as my build goes, I also pull from the oil pan for my blower so that plays a factor in my particular case...
If it got anywhere near -20* in my parts, I would have to pack up and move south..... The only ice I want to see is on my frosted mug and in my sweet tea....
I would be comfortable with using 10W30 synthetic at -20* but dino 10W30 seems to thicken much more at low temperatures to me.