According to the 1999 Ford Taurus Owner Guide :
( Motorcraft MERCON - V ) is used in both the AX4N and the AX4S automatic
transaxles / transmissions
It is important to know the types of fluids to put in a car. A 1995 Ford Taurus will use regular Mercon transmission fluid.
mercon 5
Mercon Automatic Transmission Fluid, ATF.
The 1998 Ford Taurus Owner Guide shows : Motorcraft MERCON - V , automatic transmission fluid For the AX4N and AX4S automatic transaxles
In a 2002 Ford Taurus the type of automatic transmission fluid to use is indicated on the automatic transmission fluid dipstick or the dipstick handle
Motorcraft MERCON automatic transmission fluid ( ATF )
Any that is Mercon 3 compliant
Motorcraft MERCON-V automatic transmission fluid ( according to the Owner Guide )
Motorcraft MERCON - V automatic transmission fluid for the automatic transaxles
According to the 1999 Ford Taurus Owner Guide : The AX4N automatic transaxle with the 3.4 liter V8 SHO came with ( Motorcraft MERCON- V automatic transmission fluid from the factory )
The 2011 Ford Taurus has a 6-speed automatic.
The 2010 Ford Taurus has a 6-speed automatic.