I need to top off power steering fluid on my 2012 Altima. it's at the min line, I want to fill it to max. anyway, the manual says to use genuine Nissan PSF or equivalent, but there's no asterisk* saying what equivalent is. anyone know if I can just top it off with some power steering fluid from Walmart ? or should I go to the Nissan dealer and probably spend more on their genuine Nissan PSF? does anyone know what is equivalent to this stuff? prestone?