The best replacement for mercon is mercon v.

The best alternatives to mercon are rated as following:
★★★★★  mercon v
★★★  dexron
★★★  mercon 5
★★★  type f
★  dextron
★  mercon lv
★  mercon sp
★  dexron iii
★  dexron lll
  atf+4
  mercon iii
  dex/merc
  dexron vi
  dexron ii

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Speaking about mercon, one probably shouldn't forget about mercon v.

Other search terms related to mercon and their ratings are:
★★★★★ mercon v
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