Originally Posted by 69GTX
I doubt there's much difference at all between Mercon V's that meet Ford's specifications (ie SuperTech and Castrol). I'd try to use one that claims to meet Ford's Approval. Even so, other major brands probably aren't much different. Last time around I used Amalie Mercon V. All of these should be semi-synthetic. Mobil 1 ATF is a high enough viscosity to meet or exceed Mercon V specs - though much more expensive than the SuperTech and others. At around $4.50/qt the SuperTech is a pretty good deal. That's what I'm using now on my 2001 AX4N.
I only know of 2 Mercon V trans fluids that meet Ford specs;Super Tech and Castrol. It actually reads that on the 2 fluid containers.
If I'm not using Motorcraft in my trucks transmission, I will ONLY use the ST, or Castrol.
There maybe be other brands of Mercon V out there that specifically state on their containers they meet Ford specs, I just don't know this.