I'd never put anything but straight motor oil in any of my cars. Pretty much every oil company states on their product data sheets not to use any type of oil additive or stabilizer with their oil. Im pretty sure the mazda owners manual says the same thing.
Oh and great picks on the oil & filter. Your mazda will be happy.
I did a little searching and some of the guys at corksport say they run a half quart of Lucas oil stabilizer in their speeds. So if it's good enough for the corksport guys, turns I trust it.
Plus I'm positive that stuff kept my Toyota Camry with 300k miles on it alive until I sold it.
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