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

Registered: 03/03/05
Posts: 2190
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?
On the internet, people can be anything they want. Why do so many choose to be stupid?

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

Registered: 12/24/09
Posts: 3113
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.
'03 Regal GS L67 3.29 GR:, PUP 5w30/TG3980, Filtermag

'99 Grand Prix L36: QS Defy 5w30/TG3387A, Filtermag

#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.
Those who say it cannot be done, should not interrupt the person doing it.
Your automaker lied!
Is this a spelling/grammar forum or BITOG?

#2198282 - 03/13/11 12:51 AM Re: mixing fluids in power steering [Re: whip]
aquariuscsm Offline

Registered: 12/30/06
Posts: 12441
Loc: South Texas,USA
My car uses atf in the power steering.
1996 Nissan 300ZX 5-speed,Arctic Pearl(#175 of 300)
Syntec 10W40/Fram Ultra
Amsoil MTG(tranny)
Amsoil 80W90 GL5(rear diff)
Mobil 1 ATF
Redline Water Wetter

#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.

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

Registered: 06/05/02
Posts: 16334
Loc: Iowegia - USA
Another recent thread about PSF:

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.
ME: I really can't stay. BED: But baby it's cold outside! smile