DEXRON
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DEXRON is a registered trademark of the General Motors Corporation. It does not describe a specification. The individual specifications are individually labelled, for example: GMN-10060 (DEXRON-VI). That particular fluid is designed for use in General Motors Hydra-matic transmissions but it is also used in a variety of other applications.
Whilst traditionally the trademark DEXRON has been associated with Automatic Transmission Fluids, more recently [[General Motors Corporation|GM}} has released gear oils under the DEXRON brand. For instance, there is now a commercially available DEXRON LS gear oil which is designed for plate differentials used in, for instance, the Corvette. There is also a DEXRON gear oil which has no friction modifier and is for use in open differentials or applications such as the Eaton Locker.
ATF Types Marketed under the DEXRON brand
All previous DEXRON specifications were replaced once DEXRON-VI was introduced. There are no valid approved products that carry the DEXRON name unless they have a DEXRON-VI approval and associated license.
DEXRON-IIE
DEXRON-IIE has been surpassed by DEXRON-III as of January 1, 1994. It is no longer available and its use is no longer recommended. DEXRON-IIE is not compatible in systems requiring DEXRON-III or DEXRON-VI.
DEXRON-III
- DEXRON-III is not compatible with the most recently designed transmissions, and the use of these earlier type fluids could result in transmission damage.[1]
- All DEXRON-III licenses expired at the end of 2006, and will not be renewed. Beyond that date, General Motors will only support the use of DEXRON-VI fluids for use in Hydra-Matic transmissions.[1] Fluids claiming DEXRON-III type performance continue to be sold under abbreviated names such as Dex/Merc, and D/M however since the DEXRON-III licensing system no longer exists, these fluids are not regulated in any way.
DEXRON-VI
DEXRON-VI was introduced in 2005. It was designed to replace all prior specifications, and is therefore backward-compatible with applications calling for DEXRON of any type. The specification (GMN 10060) defines both a performance level and specific additives that provide improved shift feel, friction durability and oxidative stability compared to earlier specified fluids.
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