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General E46 Forum
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Old 09-24-2013, 02:48 PM   #1
32800
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Dexron III = Dexron VI ??

I am planning to replace the fluid in the power steering resevoir. The manual calls for Dexron III but I can't find it anywhere. The label on the Dexron VI bottle says it replaces Dexron III.
I just want to be sure and not screw up anything down the line. I'm sure it will be OK, but I would rather put the fluid in there that it calls for.
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Old 09-24-2013, 02:51 PM   #2
Zell
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It's backwards compatible.

Dexron III systems can take Dexron VI.

Dexron VI systems cannot take Dexron III.
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Old 09-24-2013, 03:56 PM   #3
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You shouldn't have much trouble finding it, Dex III stuff is available everywhere...it is what is generally labelled as plain old ATF.

What may be a bit confusing is that, when GM went to Dex VI, the licensing agreements for Dex III were allowed to lapse, so you don't see "DEXRON-III" in big letters on the front of bottles anymore, like, for example, "DEXCOOL" on antifreeze.

Look at the less expensive bottles (Dex VI is synthetic and rather costly). If you have a Walmart nearby, their house brand (in the blue bottle). In fact, just about everybody's lowest-priced house brand ATF is compatible with the Dex III standard. I have a bottle of Castrol Transmax (green bottle) on the shelf in my garage for the PS reservoirs.
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Old 09-24-2013, 04:06 PM   #4
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Dexron III = Dexron VI ??

I put the IV. My car"s steering has no problem with it.


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Old 09-24-2013, 04:09 PM   #5
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I run Mobil 1 Synthetic ATF in the power steering system.
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Old 09-24-2013, 07:18 PM   #6
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gm no longer makes dexron3 or sell the rights for others to make dexron3. the newest formula is called dexron6. there was no dexron4 or 5...only dexronVI.
the good news is that dexron6 is backward compatible with 3 but not the other way around.
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Old 09-24-2013, 08:13 PM   #7
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jfoj,
Did you completely drain your power steering fluid before you added the Mobil 1 synthetic ATF? Can you mix Mobil 1 synthetic ATF with Dextron III or Dextron VI?
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Old 09-25-2013, 10:17 PM   #8
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Thanks for all the feedback guys. Turns out I was able to find Dex III at NAPA. I was just a little hesitant to use the Dex VI. I've read of too many instances with synthetic fluid being used in engines or other places where synthetics weren't used previously and all of a sudden seals or gaskets start leaking. Could just be coincidence, but it makes you wonder.
Anyway, the guy at NAPA was trying to convince me that I should be using hydrolic fluid for the steering!
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Old 09-25-2013, 10:40 PM   #9
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Quote:
Originally Posted by Rick369 View Post
jfoj,
Did you completely drain your power steering fluid before you added the Mobil 1 synthetic ATF? Can you mix Mobil 1 synthetic ATF with Dextron III or Dextron VI?
On this car I was not in a position to fully drain the power steering fluid. Used a pump to remove all fluid from reservoir then refilled with Mobil 1, then drove car about 5 minutes and did the pump and fill again.

Yes you can mix.

http://www.mobiloil.com/USA-English/...AQs.aspx#FAQs1

http://www.mobiloil.com/USA-English/...Oils_FAQs.aspx

Quote:
Originally Posted by 32800 View Post
I was just a little hesitant to use the Dex VI. I've read of too many instances with synthetic fluid being used in engines or other places where synthetics weren't used previously and all of a sudden seals or gaskets start leaking. Could just be coincidence, but it makes you wonder.
From the Mobil 1 FAQ pages:

" MYTH: Mobil 1 synthetic oils will leak out of the seals of older cars.

REALITY: Mobil 1 oils do not cause leaks. In fact, new Mobil 1 synthetic motor oil was tested in dozens of industry standard and original equipment manufacturers (OEMs) tests to prove its seal performance. It is fully compatible with the elastomeric materials from which all automotive seals and gaskets are made. If an older engine is in good condition and does not have oil leaks, Mobil 1 oils provide the same advantages as when used in a new engine. ExxonMobil recommends taking measures to repair the leaks, then using a Mobil 1 oil. ExxonMobil also recommends following the automobile manufacturer's manual for the proper oil to use."
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Last edited by jfoj; 09-25-2013 at 10:41 PM.
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Old 09-25-2013, 11:51 PM   #10
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Quote:
Originally Posted by 32800 View Post
Thanks for all the feedback guys. Turns out I was able to find Dex III at NAPA. I was just a little hesitant to use the Dex VI. I've read of too many instances with synthetic fluid being used in engines or other places where synthetics weren't used previously and all of a sudden seals or gaskets start leaking. Could just be coincidence, but it makes you wonder.
Anyway, the guy at NAPA was trying to convince me that I should be using hydrolic fluid for the steering!
Did you ask the NAPA guy if he would pay to repair your PS if it didn't work? Gotta love the parts store Jockys!
Some systems take a hydraulic type oil and some use ATF. If you really think about it, ATF is a hydraulic oil in that it is used to provide work force and not just lubricate like motor oil does.
I have done car work for a partial living for a lot of years and I, like you did, use what ever oil the manufacturer recommends.
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Old 09-26-2013, 11:01 AM   #11
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