最好用它原厂的（Owner's manual specifies）。

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Mazda uses a variety of automatic transmissions in their cars. At least in the Mazda6 line (which we drive), the Mazda-spec Jatco transmissions take Mazda M-V (type M5) ATF, and the Mazda-spec Aisin transmissions take Toyota T-IV ATF; Toyota T-IV is not recommended for use in transmissions for which M-V (type M5) is spec'ed, so your first trip should be to your owner's manual and see what is specified for your vehicle and transmission.

If your owner's manual specifies Mazda M-V (type M5), you have (at least) five choices.

• Your Mazda dealer's service department; or
• A Ford dealer, where you ask for Motorcraft FNR5, Motorcraft part no. XT-9-QMM5, which is identical to Mazda M-V (type M5), or
• Amazon, which sells Motorcraft FNR5, with free shipping, last I looked; or
• Various sources for Redline D4 multi-vehicle ATF (among those sources: Amazon again)

We replaced the ATF in our Mazda6 transmission spec'ed for Mazda M-V (type M5) with Redline D4 (plus 10 oz.of LubeGard red top) two months ago, and it runs like new.

Incidentally Valvoline Maxlife Dex/Merc multi-vehicle ATF used to be, but, after a reformulation, no longer is, recommended s a substitute for Mazda M-V (type M5).

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