in our cars like many japanese cars power steering fluid is transmission fluid, they are both hydraulic fluids and serve the same general purpose. i have always used import multi vehicle (castrol brand) for transmissions and power steering in these cars and have not had any issues. i have also used mercon v in the power steering and dex/merc in the power steering and have not had issues. the power steering system is not that picky on fluid type (just use good atf as it has the right conditioners) but the transmissions are picky it HAS to meet the standard listed in your manual