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You really only need one.
You're not flowing gobs of liquid through the fittings / hoses, and you're technically only venting vapors from the "crankcase".
Mazda complicates everything due to emissions. :P
If you're going to TRACK the car, cap the lower fitting!
Oil can climb up the passage and actually dump out of the lower fitting.
This is a good reason to always use the top fitting as a rule of thumb.
-Ted
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