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  1. Krex

    2010-2013 Mazda 3 Engine and Performance
    Hi, I just scheduled a 7,500 mile maintenance for my 3. In doing so the service rep mentioned they add Krex graphite oil additive to every Mazda car they sell or service. I never heard of it before that. If they're using it, I would guess it must be legit. Does anyone have any knowledge or...