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I see no reason to do either.
I have UOAs from my engine that say there's absolutely ZERO benefit to switching off 0w20. In addition I see no benefit in doing it with the gear oil either.
If you ever DO travel where it's cold you are you're likely to be quite unhappy with the thicker MTX oil when the car is cold.
I suspect the real reason for the 5w30 being used in other parts of the world is that 0w20 is hard to obtain, particularly away from major urban areas, where it's extremely common here in the United States everywhere. You can get 0w20 at any WalMart anywhere in the US, so that's not a factor here.
There are also fuel quality differences between nations, specifically in the amount of sulfur allowed. Mexico's sulfur annual average limit is three times ours (30ppm .vs. 10ppm) although their absolute maximum on a single run is comparable.
If I had any indication that using 0w20, even living in a hot climate (I'm in Florida) was insufficient, I'd have changed long ago. There's no indication of that at all and as a result there's no reason to do it. I happen to prefer Pennzoil Pure Platinum 0w20, but that's simply because at this point I have nearly 190,000 miles of service record on that oil in this engine and see no reason, absent a loss of convenient supply of it given its attractive price-point and availability, to change. The same is true for my '03 Jetta TDI; that engine has about 280,000 miles on it, all of it on Rotella T6 since the factory fill came out of it over 15 years ago, and the last time I had the rocker cover off to do the timing belt the cam was in very good condition for an engine that has a quarter-million miles on it, remaining perfectly serviceable.