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#1985803 - 08/14/10 09:50 AM Difference between Dexron III and Dexron III-H?
edweather Offline


Registered: 09/12/07
Posts: 52
Loc: Syracuse, NY
I have a '04 Chevy Colorado, 4x4, 3.5L, 5 cyl. base model. The owners manual says to use Dex III for the transmission, (or I'm assuming Dex VI, which is the synthetic.) I have some Amsoil Synthetic Universal ATF that I'd like to use. The Amsoil site states that it can be used to replace Dex III-H. So my ? is what's the difference between III, and III-H, and can I use the Amsoil? Thanks.
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#1985805 - 08/14/10 09:52 AM Re: Difference between Dexron III and Dexron III-H? [Re: edweather]
brandini Offline


Registered: 10/08/09
Posts: 1154
Loc: Richmond, VA
Look in the application guide and it tells you recommendations.

http://www.amsoil.com/mygarage/vehiclelookup.aspx
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#1985847 - 08/14/10 10:39 AM Re: Difference between Dexron III and Dexron III-H? [Re: brandini]
dparm Offline


Registered: 04/19/10
Posts: 13029
Loc: Chicago, IL
Improved version of Dexron III released in 2003.
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#1985915 - 08/14/10 12:25 PM Re: Difference between Dexron III and Dexron III-H? [Re: dparm]
edweather Offline


Registered: 09/12/07
Posts: 52
Loc: Syracuse, NY
Great. Thanks. & thanks for the link. It'll work in the tranny, but not in the transfer case......need the synchromesh stuff for that.
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#1986290 - 08/14/10 10:06 PM Re: Difference between Dexron III and Dexron III-H? [Re: edweather]
Ken2 Offline


Registered: 12/02/02
Posts: 6358
Loc: Washington St.
GM periodically updated the Dexron-III spec. "H" is the latest and last upgrade.

Dexron-VI is not necessarily synthetic. GM's Dexron-VI performance spec is so tough that it can only be met by a synthetic blend or better base oil.
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#1986600 - 08/15/10 11:49 AM Re: Difference between Dexron III and Dexron III-H? [Re: Ken2]
edweather Offline


Registered: 09/12/07
Posts: 52
Loc: Syracuse, NY
Yeah, thanks for pointing that out. I also noticed that when I was looking at the ATF in the store, I saw some Dexron VI that wasn't synthetic.
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#1986729 - 08/15/10 02:56 PM Re: Difference between Dexron III and Dexron III-H? [Re: edweather]
MolaKule Offline


Registered: 06/05/02
Posts: 17332
Loc: Iowegia - USA
DexronIII(H) had a slighty better additive package than did DexronIII. DexronIII(H) had improved oxidation resistance and an updated friction modifier.

I would recommend GM's Autot-Tract II for the TC.


Edited by MolaKule (08/15/10 02:57 PM)
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#1987371 - 08/16/10 08:16 AM Re: Difference between Dexron III and Dexron III-H? [Re: MolaKule]
endeavor to persevere Offline


Registered: 04/10/05
Posts: 488
Loc: Middle Tennessee
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