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I recently put a transmission cooler in my Gen 4 taurus, and noticed the fluid was pretty dark. So after deciding not to have a lube/oil place charge me $132 for a flush and fill, I did it myself. I think I might have messed up, though...I couldn't find enough Mercon V even after buying from two local stores, so I bought 3 gallons of Mercon III to do the flush with, which I did, dropped the pan and replaced the filter, then filled with the five or so quarts of Meron V that I had, letting Mercon III flush from the tranny as I added it. Fluid level is good, but now the car 'feels' heavier, and I've certainly dropped a second on my 0-60 time. Should I take it in for a flush to get rid of all possible Mercon III in the tranny, or what?