Any oil is better than no oil.
Just go for the best you can get. Forget the W number. It's just the winter rating. You won't be worrying about that in South America.
You can safely use 40 or 50 on your bike. 30 will work but I think it's too thin.
MA1 (or just MA) is fine with yours too. (MA2 is the new standard for wet clutches). But it didn't exist when your bike was first designed.
Instead of endlessly mixing oil just change the lot with the best you can get.
But it MUST have an MA rating . Don't use car oil.
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Did some trips.
Rode some bikes.
Fix them for a living.
Can't say anymore.
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