DEXRON III LICENSE
The catch is there is no official valid license for this fluid anymore. John Kelly (see his detailed YouTube vids), the latest replacement for Type A is DEXRON III(H). Which is mostly maintained by Weber State Prof. Dexron VI uses modern Anti-Wear chemistry. Dexron VI uses modern Anti-Oxidant and Metal Inhibitor chemistry.ĭexron III(H) uses older Anti-Wear chemistry. Dexron VI is superior in terms of Dynamic friction coefficient stability.ĭexron III(H) uses older Anti-Oxidant and Metal Inhibitor chemistry. Dexron VI is superior in terms of viscosity stability.įriction Modification Stability: In Dyno tests, Dynamic friction coefficient change: Dexron III(H) -~ 3%, Dexron VI - ~ 0.05%. (>=35k): Dexron III(H) - 4.3 cSt, Dexron VI - 5.5 cStĭexron III(H) has dropped over 2.8 cSt while Dexron VI has remained stable with only a 0.4 cSt drop. Shear Stability (~ 10k miles): Dexron III(H) - 4.5 cSt, Dexron VI - 5.8 cSt Starting III(H) 7.3 cSt, Dexron VI - 5.9 cSt Dexron III(H) is 1.4 cSt higher at 100C than Dexron VI but: Let's look at some of the Dexron III(H) and Dexron VI stats. This means Dexron VI has better cold temperature operation than does the Dexron III(H) or Dex/Merc.
One other important specification 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. The KRL tests have been shown to provide the better accelerated shear tests, in which all of the above fluids have been subjected. 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. Redline D6 ATF: Starting viscosity - 6.4 cSt, cannot shear down to less than 6.1 cST under standard tests. MaxLife ATF: Starting viscosity - 5.91 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 GM Dexron VI: Starting viscosity cannot be > than 6.4 cSt cannot shear down to less than 5.5 cST under standard tests Here are some facts and specifications about these Dexron fluids:ĭex III/Mercon type fluids: Max cSt 7.5 shears down to 4.2 cSt under standard tests
DEXRON III FULL
TIP: Simply topping off the fluid is adequate, but a full drain and replacement is preferred, to obtain the full benefit. DEXRON-VI is also compatible with any former version of DEXRON for use in automatic transmissions. But more important, earlier type fluids are NOT FORWARD COMPATIBLE with transmissions that were designed to use DEXRON-VI.ĭEXRON-VI can be used in any proportion in past model vehicles equipped with an automatic transmission, in place of DEXRON-III (for instance, topping off the fluid in the event of a repair or fluid change). IMPORTANT: As with previous upgrades, DEXRON-VI fluids are designed to be backward compatible with earlier transmission hardware. The upgrading process ensures that available service fill fluids are of an appropriate quality for use in transmissions that have been designed around the improved factory fill fluid performance.
DEXRON III UPGRADE
Since GM introduced the first service-fill specification for automatic transmission fluid (ATF) in 1949, it has been necessary periodically to upgrade the specification as part of a continuous improvement strategy.
Here are some facts to help clear up these misunderstandings. 1) was introduced into production starting with 2006 model year vehicles (see bulletin 04-07-30-037D), there are still some misunderstandings about it.
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