I’m not debating you anymore. You’re just trying to be difficult all while running 5W30.
Nah, as long as you keep your facts straight, I'm pretty easy. These forums are public -- they're not just for you and me. Thus, I'm not 'debating' you personally. I've already demonstrated my willingness to concede. But, with the same fervor, I won't concede to misinformation. You are free to spout it. I'm free to call you out. That is what you are perceiving as difficult.
IMHO, I feel that you, or anyone else, who runs 5W30 and suddenly needs a lubrication-related USA-based warranty claim, might have a very difficult time if Mr. T knew. You may not care...but I'd like others to be really clear on that. It's a risk that you/they are taking.
And, consider your OP: even IF all this 'debate' is just an EPA thing (I'm now on your side with that), I hope you realize
that is not at all insignificant. Can you imagine the hot water Toyota would be in if they somehow acknowledged, even indirectly, that their owners can violate emission-based law and still be honored with warranty consideration? I tell you: if Mr. T thinks you refused to follow their oil specification, regardless of how or why they were derived, I think you'd be f'ed. It's not really going to matter what is permitted in other countries.
You are convinced, and have me convinced, that mechanically we should be fine. Ok. But then when you go all Oprah on me -- "You're fine! And you're fine! Everybody is fine!" -- then I think you perhaps exceed your expertise? You are taking a huge risk. You deem your probability as low -- agree. But you don't seem to be accurately evaluating the potential consequence: no warranty coverage. Keep it simple. The manual leaves no doubt.
For me? Yes, I'm going to try 5W30. But that's because my consequence is already established: no warranty coverage. You helped resolved my probability concerns.
None of this has been difficult for me -- so I will likely struggle with what you think is me being difficult. Thanks for your OP, and your patience in helping this thread be more accurate and more thorough.