Merc V in Dex III

[Laddbg]

Need to change the tranny fluid in my 2002 2500 HD with the 4L80E. GM says use Dex III. I found a good deal on Valvoline Full Synthetic Mercon V that states for use in transmissions calling for Dexron-III/Mercon fluids. What do you guys think run the Valvoline Merc V or wait till I can get some Dex VI.

 

[hate2work]

Run it, Merc V is an upgrade of Dex III.

 

[beast3300]

You should be fine with merc V. Dex6 is alot nicer though.

 

[SLJ2137694]

DEXRON VI is the latest fluid spec from GM, that is what I would run. It is far superior to DEXRON III.

 

[MaximaGuy]

I would vote for MerconV -- many steps ahead of DexIII.

Stay away from these super thin DexVI ATF for old vehicles!!! Even though it is speced to be backward compatible for GM vehicles, I would not risk with DexVI.

 

[mechanicx]

Dex VI works great in older Dexron spec transmissions.

 

[Bluestream]

Use the Mercon V, I have it in all my GM and BMW that call for Dex III.

You may find the Dex VI very thin, it is designed for 2006 and up GM products

 

[daves87rs]

Originally Posted By: mechanicx
Dex VI works great in older Dexron spec transmissions.


+1

 

[mcrn]

Originally Posted By: MaximaGuy
I would vote for MerconV -- many steps ahead of DexIII.

Stay away from these super thin DexVI ATF for old vehicles!!! Even though it is speced to be backward compatible for GM vehicles, I would not risk with DexVI.


Will you please explain the risks?

 

[JT1]

Originally Posted By: mcrn
Originally Posted By: MaximaGuy
I would vote for MerconV -- many steps ahead of DexIII.

Stay away from these super thin DexVI ATF for old vehicles!!! Even though it is speced to be backward compatible for GM vehicles, I would not risk with DexVI.


Will you please explain the risks?


I too would like too know.