DEXRON

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A bottle of Dexron-II fluid marketed under the AutoPar brand by Chrysler Canada, early 1980s

Dexron is the trade name for a group of technical specifications of automatic transmission fluid created by General Motors (GM). The name is a registered trademark of GM, which licenses the name and specifications to companies which manufacture the fluid and sell it under their own brand names.

Originally the Dexron name was associated exclusively with automatic transmission fluids, but more recently[when?] GM has released Dexron-branded gear oils.

The brand name is commonly mispronounced as "Dex-tron".

Automatic transmission fluids[edit]

The original Dexron transmission fluid was introduced in 1968. Over the years, the original Dexron was supplanted by Dexron-II, Dexron-IIE, Dexron-III, and Dexron-VI, which is the current fluid. GM has upgraded the Dexron specifications over the years; newer fluids are generally but not always backward compatible with previous fluids. Because there are still applications for which Dexron-VI is either not suitable or not necessary, there remains a market for fluids meeting earlier specifications.

Dexron[edit]

The original Dexron fluid, like its predecessor Type-A/Suffix-A, used sperm whale oil as a friction modifier. The U.S. Endangered Species Act banned the import of sperm whale oil, so the fluid had to be reformulated.[1]

Dexron-II, IID and IIE[edit]

Dexron-II was introduced in 1972 with alternative friction modifiers such as Jojoba oil. However, it caused problems with corrosion-prone solder in GM's transmission fluid coolers;[2] accordingly, corrosion inhibitors were added to the product. The resultant fluid, released in 1975, was called Dexron-IID. However, the corrosion inhibitor made the new fluid hygroscopic, which while it was not a major problem in automatic transmissions, made Dexron IID unsuitable for other hydraulic systems in which it was commonly used.[2] A further reformulation to address excessive hygroscopicity was named Dexron-IIE.

Dexron-III[edit]

In 1993, GM released new Dexron-III fluid. It is generally backward-compatible with transmissions using earlier Dexron fluids or Type-A/Suffix-A fluid.

Dexron-VI[edit]

The fluid specification for Dexron-VI was introduced in 2005, and was first used as the GM factory-fill automatic transmission fluid for model year 2006. All Dexron-III licenses expired permanently at the end of 2006, and GM now supports only Dexron-VI fluids for use in their automatic transmissions,[3] although fluids asserted by their manufacturers to meet Dexron-III standards continue to be sold under names such as Dex/Merc. These fluids are not regulated or endorsed by GM.[4]

Dexron VI is of a slightly lower viscosity when new compared to the prior Dexron fluids (a maximum of 6.4 cSt at 100°C for Dexron VI and 7.5 cSt for Dexron III), but the allowed viscosity loss from shearing of the ATF during use is lower for Dexron VI, resulting in the same lowest allowed final viscosity for both Dexron III and VI (5.5 cSt).[5] The lower viscosity is intended to gain improvements in fuel economy by lessening parasitic drag in the transmission. Since Dexron VI is not allowed to thin out (lower its viscosity) as much as Dexron III during use, it requires the use of higher-quality, more shear-stable (less prone to thin ess in use) base oils.[4]

References[edit]

  1. ^ "Biochemicals for the Automotive Industry" (PDF). Retrieved 2013-12-27. 
  2. ^ a b Michell, Richard. Which Oil?: Choosing the Right Oil and Grease for Your Antique, Vintage, Veteran, Classic or Collector Car. Retrieved 2011-11-09. 
  3. ^ "General Motors Dexron-VI Global Service Fill Specification". Webcitation.org. Retrieved 2013-12-27. 
  4. ^ a b "Lube Report: GM Rolls Out Dexron-VI". Webcitation.org. Retrieved 2013-12-27. 
  5. ^ "Redline Oil product description of D6 ATF". Webcitation.org. Retrieved 2013-12-27. 

External links[edit]