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Can the flexible oil change schedule be followed in severe driving conditions? I make mostly short trips and let my car idle while it defrosts in the winter. Can I still trust the computer to calculate oil life or should I be on a fixed schedule?

I've read the manual, but it's a little confusing. So, here I am.
 

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The algorithm that Mazda uses to determine oil service life is not very advanced, so I'd stick with the fixed intervals in your situation.
 
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