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I don't know about the E4, but the ZF-5 in my '95, while admittedly a manual trans, states right on the side of the trans, "SYNTHETIC ATF ONLY". That would be Merc V; Merc III is dino. Also, from what I've learned, Mercon is Ford's formulation, Dexron is a GM formulation, and ATF+4 is Chrysler. Fortunately, Auto Zone has a generic of Merc V, so rather than spending $10/qt for Mobil 1 Merc V, I can get it for half that.
1995 F250 XLT 7.3T (on donor '97 engine with 180xxx miles) 4x4 - LuK SMF, Diamond Eye 3" downpipe to 5"straight-pipe exhaust. ZF5 manual trans, Curt hide-away gooseneck hitch, Super Duty suspension conversion.
1997 F250 XLT 7.3T - 2wd E4OD, alloy wheels w/ bald tires, gooseneck hitch, pretty much bone stock. Soon to become a trailer, spare tires, spare parts, and scrap.