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#739669 - 10/03/06 07:07 AM dexron III instead of dexron VI..*gulp*
spongebob Offline


Registered: 02/11/06
Posts: 10
Loc: eastern high sierras
parts guy at the dealer sold me 8 quarts of dexronIII said this is waht they use in the shop..after dumping the atf into the tranny and fireing it up, i noticed the dip stick says dexron VI on it...now what?

my truck is a 06 duramax with a 6 speed allison auto transmission...

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#739670 - 10/03/06 07:25 AM Re: dexron III instead of dexron VI..*gulp* [Re: spongebob]
obbop Offline


Registered: 06/24/04
Posts: 2834
Loc: MO
Go to the service department, show them the stick of dip, tell them what THEIR supposedly trained seller of parts said, then firmly ask them to do what they know needs done.

If step one doesn't work, come back here.
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#739671 - 10/03/06 08:31 AM Re: dexron III instead of dexron VI..*gulp* [Re: obbop]
G-MAN Offline


Registered: 11/15/02
Posts: 8936
Loc: SC
You need to get the correct fluid, Dex VI, flush all the Dex III out, and put the Dex VI in.

This transmission was not designed to operate correctly on Dex III.
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#739672 - 10/03/06 05:58 PM Re: dexron III instead of dexron VI..*gulp* [Re: G-MAN]
nascarnation Offline


Registered: 04/30/04
Posts: 818
Loc: Indiana
Quote:


This transmission was not designed to operate correctly on Dex III.



Actually your Allison will run fine on Dex III.
http://www.allisontransmission.com/service/faq/index.jsp?CategoryID=11#98
I was designed and developed with Dex III and none of the 2006 changes require Dex VI, which was primarily developed for the new Hydramatic 6 speeds. TranSynd will be even better and should be a lifetime fill in your pickup.

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#739673 - 10/03/06 06:34 PM Re: dexron III instead of dexron VI..*gulp* [Re: nascarnation]
Kestas Offline



Registered: 06/04/02
Posts: 12392
Loc: The Motor City
Assuming it'll run fine on Dex III, keep in mind that the main difference between the two fluids is that the useful life of Dex III is half that of Dex VI.

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#739674 - 10/03/06 07:00 PM Re: dexron III instead of dexron VI..*gulp* [Re: Kestas]
G-MAN Offline


Registered: 11/15/02
Posts: 8936
Loc: SC
Quote:

Actually your Allison will run fine on Dex III.




My mistake. I was thinking he had the new 6 speed that requires Dex VI. He needs to make sure he doesn't before continuing to use Dex III.

Quote:

Assuming it'll run fine on Dex III, keep in mind that the main difference between the two fluids is that the useful life of Dex III is half that of Dex VI.




Actually, the biggest difference between Dex III and Dex VI is the viscosity. Dex VI is a much thinner ATF.
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#739675 - 10/03/06 11:34 PM Re: dexron III instead of dexron VI..*gulp* [Re: G-MAN]
Kestas Offline



Registered: 06/04/02
Posts: 12392
Loc: The Motor City
From older discussion, I was under the impression that Dex VI was only a little thinner, not much thinner.

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#739676 - 10/04/06 12:22 AM Re: dexron III instead of dexron VI..*gulp* [Re: Kestas]
Ray H Offline


Registered: 01/16/03
Posts: 4478
Loc: Southern California
I'd bet the D-III will be fine for 15,000-20,000 miles at which point, drain it and replace it with D-VI. Think of this episode as an "extended flush"...

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#739677 - 10/04/06 12:46 AM Re: dexron III instead of dexron VI..*gulp* [Re: Kestas]
G-MAN Offline


Registered: 11/15/02
Posts: 8936
Loc: SC
Quote:

From older discussion, I was under the impression that Dex VI was only a little thinner, not much thinner.




Around 7.0 cap for Dex VI, if I remember correctly. I think Dex III is capped at around 8.5.
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#739678 - 10/04/06 01:22 AM Re: dexron III instead of dexron VI..*gulp* [Re: G-MAN]
unDummy Offline


Registered: 02/01/03
Posts: 8756
Loc: RI
Its an Allison, use a TES-295 ATF.

If the vehicle isn't worked, the DexronIII will work fine. I just don't see it as a fluid for extended usage. Throw in a bottle of lubegard red, run it for 10k miles, then switch back to DexronVI or a full synthetic Dexron III.
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#739679 - 10/04/06 09:46 AM Re: dexron III instead of dexron VI..*gulp* [Re: unDummy]
The Critic Offline


Registered: 08/30/04
Posts: 19882
Loc: CA
Dex VI is capped in the mid 6 range, but the Petro-Canada Dex VI product is 6.0cst @ 100C. Most Dex IIIH fluids are 7.5.

While the fluid may be OK for the transmission in terms of protection, GM may have changed some programming of the transmission software to accommodate the Dex VI fluid. For instance, since Dex VI flows much better (and is much thinner) at low temps compared to Dex IIIH, the transmission may behave strangely if operated under extremely cold conditions.
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#739680 - 10/04/06 10:07 AM Re: dexron III instead of dexron VI..*gulp* [Re: The Critic]
G-MAN Offline


Registered: 11/15/02
Posts: 8936
Loc: SC
Quote:

Dex VI is capped in the mid 6 range, but the Petro-Canada Dex VI product is 6.0cst @ 100C. Most Dex IIIH fluids are 7.5.




I've got just one thing to say to you:






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#739681 - 10/05/06 01:27 AM Re: dexron III instead of dexron VI..*gulp* [Re: G-MAN]
Whitewolf Offline


Registered: 10/05/06
Posts: 2912
Loc: MI, USA
The DEXRON-VI fluid is thnner when it's new (6.0cSt at 100C as you said) however the DEXRON-III fluids are typically not shear stable so the viscosity drops rapidly from about 7.5 cSt at 100C when new to about 5.0 cst in just a few thousand miles. In the end they can go as low as 4.0 cst.
The viscosity difference is the most visible feature of DEXRON-VI vs DEXRON-III but it isn't the biggest difference. The biggest differences are in thermal stability and friction durability (compare the specs and you will see.
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#4647966 - 01/27/18 12:00 PM Re: dexron III instead of dexron VI..*gulp* [Re: spongebob]
Nolefan Offline


Registered: 01/19/17
Posts: 7
Loc: FL
This is what it says on Wikipedia.



This says that the thinner Dexron VI is better than the min shear viscosity of 4.2. it also says that it maintains viscosity better Than Dexron 3.


As for Amsoil ATF specs



Even the Amsoil OEM version of their ATF thin is 5.8, still better than the min requirement of 4.2

Amsoil has warranty secure for their products. They stand behind it even when it's still under manufacturer warranty.

Believe it. I am not an Amsoil Dealer, but I have studied data and third party test about them. They appear to be as good as their claims. Also, Amsoil has longer life than most other brands.



Edited by Nolefan (01/27/18 12:10 PM)

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#4648178 - 01/27/18 04:42 PM Re: dexron III instead of dexron VI..*gulp* [Re: spongebob]
MolaKule Offline


Registered: 06/05/02
Posts: 19135
Loc: Iowegia - USA
Amsoil's ATL is imply their LV version of the 6.X cSt ATF comparable to Dexron VI.

See

Dexron VI Improvements

and Whitewolf's quote above (he helped develop it):

Originally Posted By: Whitewolf
The DEXRON-VI fluid is thnner when it's new (6.0cSt at 100C as you said) however the DEXRON-III fluids are typically not shear stable so the viscosity drops rapidly from about 7.5 cSt at 100C when new to about 5.0 cst in just a few thousand miles. In the end they can go as low as 4.0 cst.
The viscosity difference is the most visible feature of DEXRON-VI vs DEXRON-III but it isn't the biggest difference. The biggest differences are in thermal stability and friction durability (compare the specs and you will see.


Edited by MolaKule (01/27/18 04:46 PM)

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