Oil Question...

As many of you know from my prior posts, my 2008 Prius is burning oil, which I know is common in older Prius'.

I'm checking it religiously now every 3-4 days and topping off when needed.

My question is...I've always used full synthetic 5W-30 on oil changes since buying the car 4 years ago.

But due to the oil burning issue and the extremely frigid temperatures here over the last 2 months, in addition to my car running in ready mode for extended periods, someone recently said I'd be better off using 0W-30 instead, as it's much better in freezing temperatures because it's less viscous/thinner.

Is this sound advice?

If so, I'll pick up a couple of quarts today.

TIA