Here are some facts and specifications about these Dexron fluids:
Dex III/Mercon type fluids: Max cSt 7.5; shears down to 4.2 cSt under standard tests;
GM Dexron VI: Starting viscosity cannot be > than 6.4 cSt; cannot shear down to less than 5.5 cST under standard tests;
Mobil 1 Dexron VI: Starting viscosity - 5.83 cSt, cannot shear down to less than 5.5 cST under standard tests;
MaxLife ATF: Starting viscosity - 5.91 cSt, cannot shear down to less than 5.5 cST under standard tests;
Redline D6 ATF: Starting viscosity - 6.4 cSt, cannot shear down to less than 6.1 cST under standard tests.
Shear testing is done using four tests; the Fuel Injector Shear Stability test, the Sonic shear test, the DEXRON®-III Cycling test and the KRL test.
The KRL tests have been shown to provide the better accelerated shear tests, in which all of the above fluids have been subjected.
One other specification that is important is the Brookfield viscosity at -40C for the Dexron VI has to be at least 5000 units lower than the Dexron III(H) or Dex/Merc.
This means the Dexron VI has better cold temperature operation than does the Dexron III(H) or Dex/Merc.
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Let's look at some of the Dexron III(H) and Dexron VI stats. Dexron III(H) is 1.4 cSt higher at 100C than Dexron VI but:
Starting
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exron III(H) 7.3 cSt, Dexron VI - 5.9 cSt
Shear Stability (~ 10k miles): Dexron III(H) - 4.5 cSt, Dexron VI - 5.8 cSt
Shear Stability .(>=35k): Dexron III(H) - 4.3 cSt, Dexron VI - 5.5 cSt
Dexron III(H) has dropped over 2.8 cSt while Dexron VI has remained stable with only a 0.4 cSt drop. Dexron VI is superior in terms of viscosity stability.
Friction Modification Stability: In Dyno tests, Dynamic friction coefficient change: Dexron III(H) -~ 3%, Dexron VI - ~ 0.05%. Dexron VI is superior in terms of Dynamic friction coefficient stability.
Dexron III(H) uses older Anti-Oxidant and Metal Inhibitor chemistry. Dexron VI uses modern Anti-Oxidant and Metal Inhibitor chemistry.
Dexron III(H) uses older Anti-Wear chemistry. Dexron VI uses modern Anti-Wear chemistry.
