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#2197921 - 03/12/11 05:12 PM mixing fluids in power steering
whip Offline


Registered: 03/03/05
Posts: 1569
Loc: ohio
In the past, I've always topped off my power steering fluid reservoir with power steering fluid. I was going to change the fluid, and both of my cars, a Ford and a Nissan, call for auto transmission fluid. What happens when these fluids mix? How common is ATF in the power steering system?

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#2197967 - 03/12/11 05:58 PM Re: mixing fluids in power steering [Re: whip]
beast3300 Offline


Registered: 12/24/09
Posts: 3022
Loc: Ohio
Most of the time the mixing is usually PSF added in a ATF system as oppose to the other way. From what I have experience it will produce a very black fluid in the reservoir. Other than that I haven't seen huge complications.

Many Imports are ATF.
Chrysler started using ATF+4 in power steering around 04 I think.
Ford of course type F then switched to Mercon V.
German cars use something alittle more specific.
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#2197972 - 03/12/11 06:02 PM Re: mixing fluids in power steering [Re: whip]
unDummy Offline


Registered: 02/01/03
Posts: 8756
Loc: RI
ATF is common in PS systems.

I've never had a problem with a PSF/ATF mix. But, I don't purposely mix them.

If you require ATF in your PS system, use it.
If you require PSF in your PS system, use it.
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#2198282 - 03/13/11 12:51 AM Re: mixing fluids in power steering [Re: whip]
aquariuscsm Offline


Registered: 12/30/06
Posts: 9934
Loc: South Texas,USA
My car uses atf in the power steering.
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Syntec 10W40/Fram Ultra
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Amsoil 80W90 GL5(rear diff)
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#2198830 - 03/13/11 04:19 PM Re: mixing fluids in power steering [Re: whip]
mechtech2 Offline


Registered: 09/05/06
Posts: 19479
Loc: Chicago Area
They'll mix fine.
Like mentioned, best results over the very long term should be with the recommended fluid.

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#2200186 - 03/14/11 08:01 PM Re: mixing fluids in power steering [Re: whip]
MolaKule Offline


Registered: 06/05/02
Posts: 14658
Loc: Midwest
Another recent thread about PSF:

http://www.bobistheoilguy.com/forums/ubbthreads.php?ubb=showflat&Number=2180747#Post2180747

They will mix and all are about the same viscosity, but the add packs in Redline PSF and the new GM stuff are really different.
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