Yes, Mercon (or Dextron III, the GM equivalent).
Look for labels such as "Dex/Merc" and "Domestic Vehicle ATF". The bottle will say that it meets the Mercon specs.
Don't use Mercon V fluid however. In spite of statements that it's backward-compatible with Mercon, there have been numerous reports of it negatively affecting the shift quality on the M5OD.
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