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The latest specification automatic transmission fluid(ATF) for General Motors passenger cars and light trucks is Dexron VI as July 2014. Dexron VI is downwardly compatible to previous ATF Dexron versions.
The 1999 Kia Sephia is compatible with Dexron III automatic transmission fluid (ATF). The Sephia can also use Dexron/Mercon and Mercon LV ATF.
ATF dexron IIE ATF
Dexron VI ATF or Dexron/Mercon Domestic Multi-Vehicle ATF.
Mobil 1 ATF formulated for Mercon/Dexron III is good, but anything that is certified as "Mercon/Dexron III" compatible should be ok.
ATF Dexron IID or Dexron III
Dexron III type ATF.....
Dexron II or Dexron III type ATF.....
Recommended Fluid is Dexron II or Dexron III ATF as per page 10-23 of the "OWNER'S MANUAL".....
Dexron II ATF
Dexron/Mercon ATF
It takes Dexron III ATF fluid