OF COURSE it's safe to use in a Mazda. Amsoil works in ANYTHING. Doesn't matter that there are dozens of different manufacturers, many requiring entirely different cooolant specifications- Amsoil MEETS OR EXCEEDS them all! Amazing how other companies can spend years and $$$$$ on research and development when Amsoil can just come along and trump them all with a single product. Truly incredible.
Personally, though... I'm surprised that Amsoil has bothered to come out with an antifreeze at all. 'Cause I've no doubt that their ATF meets or exceeds even antifreeze requirements. [censored], you could probably use it for motor oil, too; one fluid that does it all.