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I put 5W-20 blended with Lubromoly, a little 5W-30, and a bit of Marvel Mystery Oil in my 10W-30 spec 1ZZ-FE (the additives just make me feel good, snake oil). My reasoning is that my engine is not up to operating temperature over 70% of the time the engine is running (read: mostly cold starts and 1-2 mile trips) so using a 5W-20 means it'll be at the correct viscosity more of the time. If operating temp is noticably higher I'd be concerned though, I do notice higher oil consumption with 5W-20 which is mildly concerning.
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