TBH, I shyed away from MaxLife in my parent's Lexus LS430 and my Prius - WS was cheaper for me(it helps to know someone at the dealership) but I'll probably use it next spill and fill in the LS but probably not in the Prius - there is ATF being pumped through the transaxle despite it being splash-lubricated. That pumped fluid does drip on the 2 electric motors and I'm not sure if MaxLife is detrimental to the winding insulation.
Toyota really should have a certification program like Mopar, GM and Ford have for their ATFs. I mean if Castrol, SOPUS and P66 got their "universal" ATFs approved by Ford and GM for Dexron VI and Mercon V/LV(and ULV eventually), it shouldn't be too hard for them to pass Toyota or JASO testing. There is a gray area for Japanese ATF, a Toyota engineer said in a presentation at JASO that genuine parts ATF is best but a "superior-type ATF" is suitable and that spec is JASO M315 which all the "universals" are self-certified by the add pack suppliers and blenders to meet.
Toyota really should have a certification program like Mopar, GM and Ford have for their ATFs. I mean if Castrol, SOPUS and P66 got their "universal" ATFs approved by Ford and GM for Dexron VI and Mercon V/LV(and ULV eventually), it shouldn't be too hard for them to pass Toyota or JASO testing. There is a gray area for Japanese ATF, a Toyota engineer said in a presentation at JASO that genuine parts ATF is best but a "superior-type ATF" is suitable and that spec is JASO M315 which all the "universals" are self-certified by the add pack suppliers and blenders to meet.