Here is my e4od input. As stated above they are very picky on fluids. I do not agree with dual rated fluids, but to every person thier own. The e40d likes a good quality Mercon fluid. The best way I know of to tell is either shake the bottle of pour a little bit.

Wal-Marts Mercon fluid, is very thin, and the 2 vehicles i have seen it in, shifted hard. If you shake it its thin, and when you pour it out its not as red as some better fluids. I work at a Ford garage and use Motorcraft and my tranny shifts great with a pile of miles on it. When poured the fluid seems thinker with a LOT more red color. Napa or Valvoline is the same way, as are Pennzoil. Those are ones Ive used. So it doesnt matter what name is on the bottle, if its a good grade, it should be fine for that tranny.