Transmission fluid...yet another question

[Wrexxer]

Hey guys,

I’ve searched this and can’t really get the right answer.

For the 2007 PCM tranny the manual states to use Dexron III. I’ve read here that DeX/Merc is equivalent.

I have access to Dexron III / Mercon V both Valvoline and Castrol. But Valvoline also has DeX/Merc which is different container?

Is there a difference where I should pick either Dexron III or DEC/MERC??

While we are at it, any preference between Valvoline and Castrol?


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[Big3Skier]

Valvoline Dex/Merc works and you can get it at Walmart or most auto parts stores

[Infinity]

I went with a true Dexron III on my PCM. Found some and ordered on Amazon cause I could not find any locally. Just didn't want to risk having any issues, tho I also read certain Dex/Merc trans fluids are compatible.

[jmo]

GM stopped certifying Dex 3 awhile ago, dex/merc is the same spec, they just can’t use the dex 3 label.

Dex 6 is the replacement, fully synthetic, but PCM has never signed off on running it in their trannies so most people run Dex/merc.


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2006 SN 196 Limited Excalibur
2001 Super Sport Limited GT40