Doing my first in depth fluids check on our new-to-us FJ60, and the power steering fluid is a little low. Found in the owner's manual that I should refill with Dextron II or Dextron ATF. Fast forward 40 years, and I'm wondering if the Dextron VI is the best choice, since that seems to be the current version of the Dextron II, or if there's a more desirable option. No idea what's in there right now. TIA.