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dexron III instead of dexron VI..*gulp* #739669
10/03/06 07:07 AM
10/03/06 07:07 AM
Joined: Feb 2006
Posts: 10
eastern high sierras
spongebob Offline OP
spongebob  Offline OP

Joined: Feb 2006
Posts: 10
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...

Re: dexron III instead of dexron VI..*gulp* [Re: spongebob] #739670
10/03/06 07:25 AM
10/03/06 07:25 AM
Joined: Jun 2004
Posts: 2,834
MO
obbop Offline
obbop  Offline

Joined: Jun 2004
Posts: 2,834
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.


National Master-at-Arms
Student Revolutionary Strike Force
Re: dexron III instead of dexron VI..*gulp* [Re: obbop] #739671
10/03/06 08:31 AM
10/03/06 08:31 AM
Joined: Nov 2002
Posts: 8,936
SC
G-MAN Offline
G-MAN  Offline

Joined: Nov 2002
Posts: 8,936
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.


2015 Lexus IS250 (Pennzoil Platinum 0w20)
2007 Jeep Grand Cherokee (Mobil 1 HM 5w20)
2005 Corvette (RLI 5w40 HD Low Ash)
Re: dexron III instead of dexron VI..*gulp* [Re: G-MAN] #739672
10/03/06 05:58 PM
10/03/06 05:58 PM
Joined: Apr 2004
Posts: 852
Indiana
nascarnation Offline
nascarnation  Offline

Joined: Apr 2004
Posts: 852
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.

Re: dexron III instead of dexron VI..*gulp* [Re: nascarnation] #739673
10/03/06 06:34 PM
10/03/06 06:34 PM
Joined: Jun 2002
Posts: 12,883
The Motor City
Kestas Offline
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Kestas  Offline
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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.

Re: dexron III instead of dexron VI..*gulp* [Re: Kestas] #739674
10/03/06 07:00 PM
10/03/06 07:00 PM
Joined: Nov 2002
Posts: 8,936
SC
G-MAN Offline
G-MAN  Offline

Joined: Nov 2002
Posts: 8,936
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.


2015 Lexus IS250 (Pennzoil Platinum 0w20)
2007 Jeep Grand Cherokee (Mobil 1 HM 5w20)
2005 Corvette (RLI 5w40 HD Low Ash)
Re: dexron III instead of dexron VI..*gulp* [Re: G-MAN] #739675
10/03/06 11:34 PM
10/03/06 11:34 PM
Joined: Jun 2002
Posts: 12,883
The Motor City
Kestas Offline
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Kestas  Offline
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The Motor City
From older discussion, I was under the impression that Dex VI was only a little thinner, not much thinner.

Re: dexron III instead of dexron VI..*gulp* [Re: Kestas] #739676
10/04/06 12:22 AM
10/04/06 12:22 AM
Joined: Jan 2003
Posts: 4,478
Southern California
Ray H Offline
Ray H  Offline

Joined: Jan 2003
Posts: 4,478
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"...

Re: dexron III instead of dexron VI..*gulp* [Re: Kestas] #739677
10/04/06 12:46 AM
10/04/06 12:46 AM
Joined: Nov 2002
Posts: 8,936
SC
G-MAN Offline
G-MAN  Offline

Joined: Nov 2002
Posts: 8,936
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.


2015 Lexus IS250 (Pennzoil Platinum 0w20)
2007 Jeep Grand Cherokee (Mobil 1 HM 5w20)
2005 Corvette (RLI 5w40 HD Low Ash)
Re: dexron III instead of dexron VI..*gulp* [Re: G-MAN] #739678
10/04/06 01:22 AM
10/04/06 01:22 AM
Joined: Feb 2003
Posts: 8,756
RI
unDummy Offline
unDummy  Offline

Joined: Feb 2003
Posts: 8,756
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.


Those who say it cannot be done, should not interrupt the person doing it.
Your automaker lied!
Is this a spelling/grammar forum or BITOG?
Re: dexron III instead of dexron VI..*gulp* [Re: unDummy] #739679
10/04/06 09:46 AM
10/04/06 09:46 AM
Joined: Aug 2004
Posts: 20,509
CA
The Critic Offline
The Critic  Offline

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Posts: 20,509
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.


2011 Toyota Prius 1.8L - 185K - SuperTech Dexos Full Syn 0W-20
2007 Honda Accord 2.4 - 135K - Mobil 1 EP HM 5W-30
Re: dexron III instead of dexron VI..*gulp* [Re: The Critic] #739680
10/04/06 10:07 AM
10/04/06 10:07 AM
Joined: Nov 2002
Posts: 8,936
SC
G-MAN Offline
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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:








2015 Lexus IS250 (Pennzoil Platinum 0w20)
2007 Jeep Grand Cherokee (Mobil 1 HM 5w20)
2005 Corvette (RLI 5w40 HD Low Ash)
Re: dexron III instead of dexron VI..*gulp* [Re: G-MAN] #739681
10/05/06 01:27 AM
10/05/06 01:27 AM
Joined: Oct 2006
Posts: 2,912
MI, USA
Whitewolf Offline
Whitewolf  Offline

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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.


My definition of an expert in any field is a person who knows enough about what's really going on to be scared.
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Re: dexron III instead of dexron VI..*gulp* [Re: spongebob] #4647966
01/27/18 01:00 PM
01/27/18 01:00 PM
Joined: Jan 2017
Posts: 7
FL
Nolefan Offline
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Posts: 7
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.


Last edited by Nolefan; 01/27/18 01:10 PM.
Re: dexron III instead of dexron VI..*gulp* [Re: spongebob] #4648178
01/27/18 05:42 PM
01/27/18 05:42 PM
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Posts: 19,761
Iowegia - USA
MolaKule Offline
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MolaKule  Offline
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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.

Last edited by MolaKule; 01/27/18 05:46 PM.

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