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Old 04-06-2010, 02:59 PM   #1
kharris4
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Default Why is mixing power steering fluid bad?

What results in mixing power steering fluid? I did a brief search, didn't come up with much. I'm wondering if steering vibrations could occur from this.
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Old 04-06-2010, 03:26 PM   #2
Uncle Scotty
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your car does NOT USE ANY power steering fluid in it anywhere

it DOES use Dextron ATF in the power steering system


that is a common problem....using the WRONG thing in it
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Old 04-06-2010, 10:21 PM   #3
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Well, mixing power steering fluid into the ATF which comes in the system will make for some pretty irregular steering response, since they are different viscosities and immiscible.

Power steering fluid will work if you flush a few bottles through the system, but there aren't any benefits and it doesn't last nearly as long.
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Old 04-07-2010, 07:08 AM   #4
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I should have known this from the start.

Thanks guys.
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Old 04-07-2010, 11:27 AM   #5
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Quote:
Originally Posted by sniper1rfa View Post
Power steering fluid will work if you flush a few bottles through the system, but there aren't any benefits and it doesn't last nearly as long.
I don't think it will work. Every Subaru car I've ever seen someone use it in for extended periods has resulted is a bad pump. Every one.
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Old 04-07-2010, 11:29 AM   #6
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I'm gonna flush it and put ATF back in.
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Old 04-07-2010, 12:47 PM   #7
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Originally Posted by kpluiten View Post
I don't think it will work. Every Subaru car I've ever seen someone use it in for extended periods has resulted is a bad pump. Every one.
Could be wrong. AFAIK both are simply hydraulic oils - the ATF merely lasts a lot longer (it's much more highly developed). It's not helpful anyway, so the point is moot.
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Old 04-07-2010, 03:21 PM   #8
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The correct fluid is Dexron III (A/K/A: Mercon/Dexron III).

Respectfully, there is no "T" in Dexron.

Do not use any other fluid in your power steering system.
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Old 04-07-2010, 08:19 PM   #9
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Originally Posted by Big-E View Post
The correct fluid is Dexron III (A/K/A: Mercon/Dexron III).

Respectfully, there is no "T" in Dexron.

Do not use any other fluid in your power steering system.

I've seen people recommend M1 synthetic ATF? does that fall under Dexron III or?
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Old 04-07-2010, 08:58 PM   #10
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Originally Posted by sLicK 2004 View Post
I've seen people recommend M1 synthetic ATF? does that fall under Dexron III or?
Yes. It just is better in sever applications. Just like any other synthetic. I've been running Mobile 1 for years now.

Edit: http://www.mobiloil.com/USA-English/...hetic_ATF.aspx

Last edited by Web Foot STi; 04-07-2010 at 09:03 PM.
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Old 04-08-2010, 07:08 AM   #11
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Do you guys think that mixing about 1 cup of PS fluid into the system could cause a short steering wheel vibration after hitting a bump while driving on the freeway?
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Old 04-08-2010, 01:40 PM   #12
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vibration? no. It will make the steering feel "lumpy" while turning.
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Old 04-08-2010, 07:46 PM   #13
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I don't even mix fluids in my beater.
I've had terrific results with Redline D4 ATF.
I also run a custom made cooler of my design that utilizes a 10 row Earl's radiator.
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Old 12-20-2013, 02:56 PM   #14
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thank you all comments really helpful. dose any one know if mixing cause damage?
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Old 12-20-2013, 07:49 PM   #15
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Quote:
Originally Posted by hellriderkc View Post
thank you all comments really helpful. dose any one know if mixing cause damage?
you didnt READ the thread

dont mix atf and ps fluid in the system.....no
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