As I've said elsewhere, I needed a title exactly once out of fifty or so Latin American border crossings---and it wasn't Mexico (I think it was Guyana). Lots of Canadians make it to Ushuaia without even being issued titles. You'll certainly need a current registration, and should make sure all your numbers are accurate.
Caveat: in this, as in everything else in the world, mileage varies.
Mark
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