I have the 2002 Taurus SEL with the DURATEC and the AX4N Transaxle. The owners manual leaves out the AX4N for scheduled regular fluid changes. The manual says to flush the fluid on the AX4S Transaxles every 30,000 miles.
The AX4N that I have happens to have the Mercon V fluid inside of it that is supposed to last the lifetime of the vehicle. Is it possible that the fluid never needs changing? Even if it does have a special fluid in it, what good would it do once the transaxle filter gets clogged from debris and can hardly squeeze any fluid through it?