When I got my '95 Mystique in March 2001, it only had 22,000 miles on it and was manufactured in July 1994. The previous owners had purchased it in Feb '96 with 200 miles on it. It did a lot of sitting, especially in the first year an a half before it was purchased, either in a warehouse or on a dealer lot. One of the first things I did was to replace all fluids and filters.
I found that the transmission front seal liked to leak on hot days, especially when using the AC. Using some Lucas transmission/gasket conditioner seemed to do the trick and it's been bone dry under there since putting it in last summer.