Toyota's Insistence on using ATF in power steering

Joined
Dec 13, 2006
Messages
647
Location
ohio
Dexron III ATF in the PS pump for Toyota's unless specified otherwise in the manual. I use plain mineral biased Dexron III ATF. The only ATF that caused pump whine in my Toyota was Castrol Dex/Merc. Do not know why that was, but as soon as I changed it out with plain Mobil Dex/Merc fluid (not Mobil-1)the whine went away immediately.
 
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