5W-20 is the way to go. A few folks on another GR forum I can't write on here otherwise it wont let me post had a thread, and one of the folks who was chiming in is a pretty credible source of information as he works in that industry.
The TLDR is that with 5w-20, engine happy and better protected at full temp and during spirited driving without sacrificing anything but a few MPG's during your first 15 mins or so while it's warming up and that running super thick oils just for the hell of it isn't a great idea.
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22' Toyota GR86 - Trueno Blue - M/T ( CURRENT)
18' Toyota 86 GT Black - Moonslate Gray - M/T ( SOLD)
13' Scion FRS - Ultramarine - A/T ( SOLD)
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