Best ATF to use in Power Steering system.

[drtyler]

As far as I know, GM has always specified a dedicated PS fluid and not ATF in their PS systems. Despite the apparent interchangeability, I use PS fluid where recommended to assist in fluid identification.

The Pontiac Vibe (aka Toyota Matrix) used Dex III in the PS system.

 

[GSCJR]

It's a Toyota, I use ATF in that one.

 

[drtyler]

It's a Toyota, I use ATF in that one.

Yes, but the Pontiac was serviced at the GM dealerships and warrantied by GM . That could be a reason why GM added tests for power steering systems. The Geo cars may be have been similar, since they were Toyota, Suzuki, etc.

 

[Whimsey]

The owner's manual for my Ford 1994 F150 calls for Ford Type F transmission fluid to be used in the power steering system. Type F is still readily available at some auto parts stores.

My 1996 Ford Contour specs Type F ATF fluid for the PS. I've been doing reservoir suction removals and adding new Type F ATF. so far after 26 years everything still functions ok. A hose and metal tube needed to be replaced do to leaking in our " brine salt-full" winters rotting everything on our vehicles.

 

[meadows]

Lots of euro cars use hydraulic fluid'

View attachment 105547

Do not mix these!

 

[Gebo]

I'm using Amsoil Power Steering Fluid in all mine.