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FAQs on GM’s DEXRON-VI Specs


By Walt Silveira, director of automotive products, lubricants, ConocoPhillips Company, Kendall, Phillips 66, 76 and Conoco brands.

The new DEXRON-VI specification handed down from General Motors has created a lot of industry buzz and some uncertainty. The following are some of the most frequently asked questions and our answers to help prepare you for the change.

Q: What is the history behind the new DEXRON-VI transmission fluid?

A: GM introduced DEXRON-VI in April 2005 as the next generation factory fill transmission fluid for 2006 model-year trucks and cars equipped with Hydra-Matic transmissions. It was developed specifically to accommodate GM’s new 6L80 six-speed automatic transmission, which places greater demands on fluid performance because of direct contact between the clutches. Ongoing changes in transmission designs such as clutch operation, increased torque ratings, reduced sump volumes and higher fluid turnover rates require higher quality fluids to ensure consistent shift performance and longer service intervals.

Q: What are the advantages of the new DEXRON-VI formulation?

A: The new DEXRON-VI fluid is a significant improvement in comparison to DEXRON-III (H) fluids. Fluid life is significantly longer due to improvements in oxidation stability, friction durability, shear stability and foam resistance over current DEXRON-III fluids.

Q: What will happen to DEXRON-III H licenses?

A: All DEXRON-III H licenses will expire at the end of 2006, and GM owner’s manuals for new vehicles will recommend only DEXRON-VI for automatic transmission fluid. DEXRON-VI fluids are back-
serviceable for 2005 and prior model-year vehicles where DEXRON, DEXRON-II or DEXRON-III fluids are specified. They are not intended for Continuously Variable Transmissions (CVT), which require a separate fluid covered by the DEX-CVT specification.
  Previous Comments
avatar   Robert   star   3/30/2010   5:56 PM

Can a BMW with a GM (5L40-E)SX-A5S360R transmission use this D6 too?

avatar   RICK   star   8/9/2009   3:18 AM

If you are using a dex-3/mercon fluid be aware that dex-6 is not compatible with mercon applications

avatar   Edward McIntosh   star   6/30/2009   12:23 PM

I am a DexVI convert, I run it in both the transmission (TH350) and power steering in my project 1980 Pontiac Bonneville. Noticeable improvement over DexIII, even synthetic DexIII.

avatar   Jason   star   3/31/2009   2:30 PM

Wal-Mart has their Supertech brand that is resonably priced. A few cents more than regular Dex III but I believe the Supertech is a synblend.

avatar   lee   star   3/30/2009   5:38 PM


avatar   Jason   star   2/24/2009   4:03 PM

Are all Dexron VI fluids supposed to be full sythetic? I know Valvoline brand is but what about Mobil 1 Dexron VI? Ive see it as a sythetic blend. Will Mobil 1 perform the same as a the Valvoline full sythetic?

avatar   Scott Rentz O'reillys Autopart   star   1/22/2009   3:54 PM

Can Dexron VI be used in place of Dexron III in older Nissan applications?

avatar   john rosalis   star   12/11/2008   11:04 AM

are you saying it can be used in place of the regular dexron-3 if the customer wants to upgrade and pay the extra cost ?

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