Dex III vs DexVI
Le Mans Master
Joined: Jun 2008
Posts: 5,284
Likes: 235
From: Rockledge FL
This issue is somewhat confused as Dexron III and VI are (or were) both specifications and product names. The main differences between the two specifications is that Dexron III could be met by a conventional basestock, whereas Dexron VI requires a better basestock, probably either a semi-synthetic or a Group III synthetic basestock. But, while the GM branded Dexron III was conventional, there are many synthetics on the market that meet the original requirements for this spec. The other main difference is that the viscosity of the Dexron VI is about 40% lower than that of the Dexron III to help GM's CAFE rating. I personally do not feel comfortable with that drop despite GM saying Dexron VI is backwards compatible. In my GM vehicles that originally required Dexron III, I use AMSOIL's Dexron III product vice the lower viscosity Dexron VI (or aftermarket alternative).
AMSOIL's offerings:
Dexron III: AMSOIL Multi-Vehicle ATF (Product Code ATFQT)
Dexron VI: AMSOIL Low Viscosity Universal Automatic Transmission Fluid (ATL) (Product Code ATLQT)
AMSOIL's offerings:
Dexron III: AMSOIL Multi-Vehicle ATF (Product Code ATFQT)
Dexron VI: AMSOIL Low Viscosity Universal Automatic Transmission Fluid (ATL) (Product Code ATLQT)
i thought that amsoil recommended the torque drive (TQD) for the MN6 fluid?
Premium Supporting Vendor
Joined: Aug 2001
Posts: 5,364
Likes: 38
From: King George VA
However, just to be clear, AMSOIL's primary recommendation for C5/C6 manual gearboxes:
AMSOIL Torque-Drive Synthetic Transmission Fluid (Product Code ATD1G)
(which is what I use)
For automatics, AMSOIL makes transmission fluids recommended for both Dex III and Dex VI:
Dex III:
AMSOIL Multi-Vehicle ATF (Product Code ATFQT)
Dex VI
AMSOIL Low Viscosity Universal Automatic Transmission Fluid (ATL) (Product Code ATLQT)
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C66 Racing #66 NASA ST2, SCCA T2
AMSOIL Dealer (Forum Vendor)
AMSOIL Preferred Customer Program (Members buy at Wholesale - a savings of about 25%)
