combine oils?

Hello I need help. What oil I must put to the Easytrinic speed box of a 2005 meriva, thanks.

Regularly the boxes with automatic changes use ATF dexron III or IV oil, which is adequate, only look for a prestigious mark here in my country I use more Castrol or Quaker which have come out excellent, now if it is manual gearbox use a multigrade oil The oils to be used in the vehicle come, and sometimes in the measurement rod

Thank you very much for the help mafuentesv