give me the specs please. What is the year and the model?
In my X when I first bought it I changed the fluid with Amsoil signature series fuel efficient synthetic. My 2006 4.4i takes 9 litres since i have the GA6HP26Z 6 speed trans. Castrol is OE so you can use that as well. You basically want a product with a higher TBN, low NOACK, oxidiation resistance and also check the viscosity index. Based off those I recommend Amsoil, Redline, Mobil 1 or Pennzoil

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Do your car and move up to Amsoil.