Mercury 1996 Sable Manual page 330

Reservoir for power steering fluid (3.0L Duratec)
Use only Mercon ATF power steering fluid.
If the power steering fluid is low, do not drive
your vehicle for a long period of time before
adding fluid. This can damage the power
steering pump.
If you check the power steering fluid when it is
cold, make sure that the fluid reaches the FULL
COLD range on the dipstick (3.0L Vulcan) or
MIN on the reservoir (3.0L Duratec). The
reading will only be accurate if the fluid
temperature is approximately 50˚F to 85˚F
(10˚C to 30˚C).
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