I was seeing well above $15 per quart
Insanity 
Sooooo $60 per gallon ! Must be āspecialā stuffā¦ I think PT Barnum made up a quote about this sort of thingā¦ Howād it go again?
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Probably not Barnum himself, but at least one of the people the quote is attributed to said it referring to Barnum
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LOLā¦ Did you guys really think I didnāt know the quote?
Yes it will. It will likely start leaking if hydraulic fluid/PSF is used. Have seen that very thing in Toyotas when PSF is used by garage mechanics who run on autopilot.
The same is true with some excavators. My Takeuchi specifies ATF as the fluid in the hydraulic system. When it was mistakenly changed with Elf Hydraulic Fluid, several seals started leaking later that year.
To paraphrase the old saying - Hydraulic fluids aināt hydraulic fluids.
As for it being superceded and no longer availableā¦
As to the original posterās question, thereās really no way to know if a different fluid will cause a leak in the future. If a leak does develop, itās because the darn thing is over 30 years old and rarely driven!
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An interesting tidbit . . .
On my Toyota, the power steering filler cap says āDexron typeā
It doesnāt specifically say Dexron II or Dexron III
The reservoir of mine, on the side, says āDexron typeā; the ownerās manual says Dexron II.
Just go to Autozone, Pepboys, or whoever, and get the store brand āDex/Mercā atf . . .
Get it over with
Sorry, I scrolled through those fluids and see no Dexron III. Dexron/Mercon and ācompatible withā and even AC Delco Professional Type III arenāt Dexron III. Iāve been down this road before. Dexron III is discontinued and not available. But hey, if one chooses to choose these fluids then thatās their decision, I guess.
CSA
So what do you propose . . . ?!
We know that true Dexron II an Dexron III are no longer available, unless somebody has some unopened containers from back in the day
Do nothing . . . ?!
Buy something that is ācompatibleā and take your chances . . . ?!
Use Dexron VI and take your chances . . . ?!
Buy that outrageously priced Toyota brand automatic transmission fluid for roughly $15 per quart . . . ?!
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Ridiculous price for sure (and ridiculous owner information), but I donāt buy Toyotas, and Iām afraid if I had one thatās what Iād buy.
I buy my GM vehiclesā PS fluid at the dealer, but itās less than 1/2 that price!
CSA
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In my previous 2006 Toyota Matrix I used Dex VI when I flushed the PS fluid every 3 years.
No problems in the subsequent 9 years I owned it.
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OāReilly Auto Parts has Dexron III
That product isnāt actually Dexron III . . . Dexron III canāt be bought new, unless somebody has some nos bottles still sitting in the back
The product you showed merely says it meets the requirements . . . not exactly the same thing, but close
That said, Iād be comfortable using that in Trollās 1987 Toyota pickup truck
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Correct. I donāt buy any of that stuff that says āmeets the requirements, etcetera.ā But, Iām just like that, I guess. The vital fluids are just too critical for āclose enough.ā Iāve never had a wrench turned on an engine (except spark plugs, oil drain plugs, and transmission pans and filters) and I donāt intend to start with that.
If there is a real aftermarket substitute for the OEM fluids it will indicate that it licensed by GM, on the bottle. I have bought Castrol Transmax brand fluids like that , for my old vehicles, but never found it in Dex III. I have evolved into Dexron VI for everything.
CSA
I donāt know what I would have used in my various Chrysler products with automatics although I think my 81 Horizon said use ATF+2 on the power steering cap.
I used to drain a quart of trans fluid out of the torque converter plug before I raced someone with my 56 Desoto but I canāt remember what the fluid was. Too many years. I do know, I never had a power steering leak on a Chrysler product.