benoh

iTrader: (13)

I currently have Valvoline's Dex/Merc ATF in my transmission but picked up some Castrol Dex/Merc ATF cause they were having a good sale.

Would mixing the two together cause issues for my transmission fluid and transmission?

I know it sounds silly but I'm sure different brands have different formulas for their Dex/Merc ATF.


Edit: Off Valvoline's website (FAQ section http://www.valvoline.com/faqs/system...mission-fluid/) it states that their ATF is compatible with most brands ATF.

I still am curious to know (any transmission gurus out there?) if it has any long term effects. Anyone have any knowledge on this?

WS6HUMMER

iTrader: (19)

X2 I built my own th400 and presoaked the clutches in dexIII but when I got ready to fill it up had been reccomended to run tractor hydraulic & trans fluid so I asked the same question you just asked on another forum and had a very reputable builder say its OK so I went with it.

themealonwheels

iTrader: (20)

Bringing this back up, I have 8 quarts of Valvoline VV353 (Dex/Merc for Dexron III applications) and about 6 quarts of Castrol Dex/Merc or Dexron VI (I can't remember at the moment) and I need to fill a 4l60e with a stock stall. Since I'll use more than 8 quarts, would it be alright to fill the balance with Castrol? The above responses seem to indicate it's alright, but is there any mixture I should avoid?

mrvedit

I doubt there is much difference between different brands of the same type AFT, but I would not mix half Dexron 3 with half Dexron 6. Pick one or the other.