Ford Mercury Villager 1997 Owner's Manual page 304

Improperly inflated tires can affect vehicle handling and
can fail suddenly, possibly resulting in loss of vehicle
control.
Tire Inspection and Maintenance
Inspect the tire treads and remove stones, nails, glass or other
objects that may be wedged in the tread grooves. Check for holes
or cuts that may permit air to leak from the tire and make the
necessary repairs.
Inspect the tire sidewalls for cuts, bruises and other damage. If
you suspect internal damage to the tire, have it removed and
checked. You may need to repair or replace it.
Tire Rotation
Because your vehicle's front and rear tires perform different jobs,
they often wear differently. To make sure your tires wear
evenly and last longer, rotate them as indicated in the following
diagram.
In situations where the tires differ from front to rear
(snow/traction), simply rotate using a side to side pattern.
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