So I guess it works. Cheers 

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I learned the hard way about oil pan heaters…I loaned a pickup to a family member, who to my ignorance left the pan heater always plugged in when not driving. In short, it quickly destroyed the oil life and caused compression ring failure in the pistons very quickly. I’d only plug that thing in 10-15 minutes prior to starting your motor and unplug it right at startup. IIRC, those pan heaters get up to 250-300 degrees, at least the one I had did.Oil advice can be a black hole of awfulness... so here we go.
You'd be better served running some sort of oil pan heater or engine block heater than changing the viscosity of your oil for short trips.
I would not want to go below a 30wt for the hot viscosity, personally. I want that protection when the engine is up to temp and I'm not trying to win any fuel economy challenges by going thinner.
0-40 for me, but honestly just keep it full of oil. It's fine. The 2UZ is not a finicky and glorious Ferrari engine... unfortunately.![]()
If the sound of those engines at redline doesn't evoke enough emotion to overcome the rational concern of the cost you're probably smarter than I.
I wasn't too motivated to do it after looking at the findings attached in post #23, maybe next time ...Should send that 0w oil off to Blackstone Labs for analysis to see how much more internal component wear is happening compared to the suggested 5w..Otherwise its just speculation in mpg's