The only way I would switch from Mercon (what the E4OD was originally filled with) to Mercon V is with a complete drain of the pan and the torque converter.
Mercon is a standard mineral oil fluid while Mercon V is a synthetic fluid. Supposedly mixing the two is no big deal but I wouldn't do it considering how expensive an E4OD transmission is. As mentioned Mercon V is supposed to handle HEAT better. Ford (Motorcraft) nolonger produces original Mercon but several aftermarket manufacturers (like Castrol) produce Mercon/DextronIII fluid that is better than the original fill fluid.
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Today's Featured Article - Harvestin Hay: The Early Years (Part 2) - by Pat Browning. The summer of 1950 was the start of a new era in farming for our family. I was thirteen, and Kathy (my oldest sister) was seven. At this age, I believed tractor farming was the only way, hot stuff -- and given a chance I probably would have used the tractor, Dad's first, a 1936 Model "A" John Deere, to go bring in the cows! And I think Dad was ready for some automation too. And so it was that we acquired a good, used J. I. Case, wire tie hay baler. In addition to a person to drive th
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