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  1. Review (ongoing) Red Line D4 Full Synthetic ATF

    2010-2013 Mazda 3 Engine and Performance
    This thread will be an ongoing review of the Red Line D4 Full Synthetic ATF. Here’s some information pulled from Red Line’s website. Red Line D4 can be used "where Dexron III®, Dexron II®, Mercon® and Mercon V® fluids are recommended, provides a GL-4 level of gear protection. Popular...
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