Far as I'm aware, there has been NO "Dexron III" since 2006, except for Dexron IIIH which went until 2011. After that, the word "Dexron" was removed from the label, with just "III (H)"
By Hymn62 - Own work, CC BY-SA 4.0, https://commons.wikimedia.org/w/index.php?curid=76037640
But there's conflicting information about the use/non-use of the word "Dexron".
Plenty of companies sell "compatible" products under the "Dex(ron) / Merc(on)" "Dex/Merc" or "D/M" descriptions.
Best I can tell, GM's AutoTrac II is Dexron III with blue dye instead of red dye. But don't take my word for it.
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By Hymn62 - Own work, CC BY-SA 4.0, https://commons.wikimedia.org/w/index.php?curid=76037640
But there's conflicting information about the use/non-use of the word "Dexron".
Plenty of companies sell "compatible" products under the "Dex(ron) / Merc(on)" "Dex/Merc" or "D/M" descriptions.
Best I can tell, GM's AutoTrac II is Dexron III with blue dye instead of red dye. But don't take my word for it.