My daughter has a '99 Ford F150 4x4 that leaked out about 2 or 3 quarts of ATF because of a leak in the cooler line. A repair garage was very nearby when she noticed the leak and they repaired the line and topped off the tranny, but used Mercon 3. I looked at the dipstick and it says Mercon 5. Should all the tranny fluid be flushed and refilled with Mercon 5 ASAP ?
I'm not really familiar with Fords, but if it's like my Dodge (which needs ATF+4 only), I figure that Mercon 3 better come out of there. Right ?