Ford 2005 Grand Marquis Owner's Manual page 155

The tires should also be balanced periodically. An unbalanced tire and
wheel assembly may result in irregular tire wear.
Tire rotation
Rotating your tires at the recommended interval (as indicated in the
scheduled maintenance information that comes with your vehicle) will
help your tires wear more evenly, providing better tire performance and
longer tire life. Unless otherwise specified, rotate the tires approximately
every 5,000 miles (8,000 km).
• Front Wheel Drive (FWD)
vehicles (front tires at top of
diagram)
2005 Crown Victoria (cro)
Owners Guide (post-2002-fmt)
USA (fus)
Tires, Wheels and Loading
155