Differences between the liquid and D III vs DIII-H

[Pidziek]

Hi,
I have a question for you, what is the difference between oil and DEXRON III DEXRON III H?
I have the Amsoil ATF DEXRON III-H in the instructions I have written that recommended for my power steering fluid is DEXRON II or DEXRON III.


Is D-III-H has some special add-ons compared to the normal D-III?
What are the differences between these fluids and the last DII DIII DIII-H ??

regards

 

[mechanicx]

Dexron IIIH has some improvements over Dexron III. I don't recall what they are. The main thing is Dexron IIIH will work in and backspec for Dexron II and III requirements.

 

[crinkles]

I used III-H for my PS at one stage. (III spec). seemed OK...

 

[Pidziek]

I wonder if these improvements can better pumpability, resistance to foaming ....
Anybody got any nearer info?

regard

 

[The Critic]

Originally Posted By: Pidziek
I wonder if these improvements can better pumpability, resistance to foaming ....
Anybody got any nearer info?

regard


Lots of improvements:

http://www.imakenews.com/lng/e_article000097887.cfm

But Dexron-VI is what you want to use today, not Dexron-III(H). All Dexron III licenses have expired.

 

[Pablo]

For sure for in your PS DIII-H will work great. No need at all to search out D-VI, especially since Dexron III is specified.

 

[JHZR2]

Yeah, D-VI is ONLY an AT specification. It is not for use in MTs and other applications as a replacement for dex III.

Dex IIIH came out when GM was making a push towards 100k ATF changes, 100k coolant changes, and 100k spearkplug changes... It is more shear-stable and "better", and what Id choose for places where dex III and II are spec'd.

 

[The Critic]

Originally Posted By: JHZR2
Yeah, D-VI is ONLY an AT specification. It is not for use in MTs and other applications as a replacement for dex III.

That's speculation. We have never had confirmation from an official GM source that that is the case.

 

[JHZR2]

GM Techlink doesnt seem to speculate:

https://bobistheoilguy.com/forums/posts/1415606/

http://www.sandyblogs.com/techlink/2009/05/dexron-vi.html

 

[The Critic]

Originally Posted By: JHZR2
GM Techlink doesnt seem to speculate:

https://bobistheoilguy.com/forums/posts/1415606/

http://www.sandyblogs.com/techlink/2009/05/dexron-vi.html


Sorry, what I meant to say is that we have never had confirmation from GM that Dexron-VI cannot be used for back service in non-GM applications.

As for the manual units, there's a lot more to the story than what techline says. Perhaps you can PM whitewolf and he can explain it to you.

 

[mechanicx]

Another thing to keep in mind is that Dex VI is more sheer stable than Dex III. Some think Dex VI is too thin for Dex III automatics but in actual service Dex III can end up being thinner.

 

[ben805]

So, all transmission that called for Dex III can pretty much switch to Dex VI??

 

[mechanicx]

Probably all automatic transmissions. Manual transmissions might be an exception.