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Old 11-08-2007, 09:22 AM   #1 (permalink)
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I'm a little confused about which power steering fluid I should use on my '07. The manual says Dextron III, but Subaru makes ATF HP transmission fluid that is also advertised as power steering fluid. It's real name is something like Subaru HP ATF/PSF, or something like that. Can I (or should I) use this for power steering fluid? and can I mix it with whats already in there? Does anyone know what it comes with from the factory?

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Old 11-08-2007, 12:08 PM   #2 (permalink)
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Found this excerpt from the www.endwrench.com article on power steering flushing: "Finally, Subaru recommends the use of Dexron III in most of its vehicles. The exceptions are 2007 WRX, STi and Turbo models, which specify Subaru Genuine Parts ATF HP."

If you have auto trans, definitely make sure to know whether it needs the Subaru/Idemitsu HP-ATF or if it can run Dexron III. Running Dexron ATF in a soob 5EAT trans that requires Idemitsu can result in some weird shifting/shuddering feelings.
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Old 11-08-2007, 12:34 PM   #3 (permalink)
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Found this excerpt from the www.endwrench.com article on power steering flushing: "Finally, Subaru recommends the use of Dexron III in most of its vehicles. The exceptions are 2007 WRX, STi and Turbo models, which specify Subaru Genuine Parts ATF HP."

If you have auto trans, definitely make sure to know whether it needs the Subaru/Idemitsu HP-ATF or if it can run Dexron III. Running Dexron ATF in a soob 5EAT trans that requires Idemitsu can result in some weird shifting/shuddering feelings.
Yes, I have auto trans, and yes it calls for Subaru HP-ATF.

I thought it was kind of funny that the owner's manual doesn't recommend a Subaru brand power steering fluid at all. They usually strongly recommend you use their brand of fluid (or anything else for that matter), but list some others that will work, too. Especially since Subaru has at least two different (?) power steering fluid products (and I get the impression I'm not supposed to use either one.)

-confused
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Old 11-08-2007, 12:38 PM   #4 (permalink)
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Just use any ordinary Dexron III fluid, and change it at its regular intervals.
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Old 11-08-2007, 12:41 PM   #5 (permalink)
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Subaru's since at least the early 90's have always just used Dexron II/III ATF in the power steering system. They don't use what is conventially called 'power steering fluid'. From the endwrench articles it appears the Idemtisu/Subaru HP-ATF can be used in any soob auto trans or power steering application that called for Dexron, but soobs trans's calling for HP-ATF cannot use Dexron.
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Old 11-08-2007, 12:43 PM   #6 (permalink)
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GM is not renewing licenses for Dexron anymore I don't think, so as time goes on more and more products will probably say 'for applications that originally called for Dexron' or some veriage like that.
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Old 11-08-2007, 01:13 PM   #7 (permalink)
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Just use any ordinary Dexron III fluid, and change it at its regular intervals.
So I can mix ordinary Dexron III with what's in there from the factory? I was thinking I would suck out what's in the reservoir and replace with fresh fluid once in a while, rather than trying to drain the whole thing.
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Old 11-08-2007, 03:34 PM   #8 (permalink)
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So I can mix ordinary Dexron III with what's in there from the factory? I was thinking I would suck out what's in the reservoir and replace with fresh fluid once in a while, rather than trying to drain the whole thing.
Ordinary dexron 3 is what is already in there. Just suck it out and replace it. The stuff that is marketed in stores as "power steering fluid" is usually based on dexron 3 with slightly different additives and a different color. Dexron 3 is a hydraulic fluid, which is what both power steering and automatic transmissions need.
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Old 11-09-2007, 05:17 AM   #9 (permalink)
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I'm using the Amsoil 'universal' synthetic ATF in both my Forester's P/S systems. Excellent stuff.

Does anyone know if the Subaru HP-ATF is actually a synthetic or semi-synthetic ATF? I can't seem to get a straight answer from dealers on this.
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Old 11-09-2007, 05:29 AM   #10 (permalink)
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The dealers probably don't know. I suspect the Idemitsu/Subaru HP-ATF is not synthetic. I suspect it is similar to Dexron, but more heavily friction modified, thus its seemingly being backwards compatible for use in Dexron applications.

+1 on the amsoil syn atf, running that in the power steering and auto trans of all three of my soobs....should've just bought the 30 gallon keg! hehehe
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