Is All Dexron III-H/M the Same?

[Falcon_LS]

I just look for the TES-295 specification for my unit requiring Dexron III.

 

[Shucks18]

All DEXRON®-III licenses expire at the end of 2006 and will not be renewed. Beyond that date GM will only support the use of DEXRON®-VI fluids for use in Hydra-Matic transmissions. Fluids sold in the market after that date bearing claims such as “suitable for use in DEXRON®-III applications” or similar wording should be avoided. DEXRON®-VI licensed fluids are fully backward compatible and can be used in all applications covered by earlier GM ATF specifications. GM does not license or support obsolete ATF specifications or the use of fluids that are being marketed against cancelled specifications.

Is that why gm sells a fluid literally called ac delco type 3?

 

[4WD]

Everyone who towed heavy around here used Mobil 1 ATF instead of DexIII

 

[kschachn]

Everyone who towed heavy around here used Mobil 1 ATF instead of DexIII

A fluid such as that or the Amsoil equivalent would be a good choice. Superior base stock giving rise to increased oxidation resistance helps at higher temperatures.