Kia Optima 2004 Owner's Manual page 215

WARNING - TIRE INFLATION
Overinflation or underinflation can
reduce tire life, adversely affect
vehicle handling, and lead to
sudden tire failure. This could
result in loss of vehicle control.
7-30
MAINTENANCE
TIRE ROTATION
To equalize tread wear, it is
recommended that the tires be rotated
every 6,000 miles (10,000 km), or sooner
if irregular wear develops.
Front
2BLA790
During tire rotation, check the tires for
correct balance.
Check for uneven wear and damage.
Abnormal wear is usually caused by
incorrect tire pressure, improper wheel
alignment, an out-of-balance condition,
severe braking or severe cornering.
Look for bumps or bulges in the tread or
side of tire. Replace the tire if you find
either of these conditions. Also, replace
the tire if you can see fabric or cord.
After rotation, be sure to bring the front
and rear tire pressures to specification
and check lug nut tightness.
Disc brake pads should be inspected for
wear whenever tires are rotated.
NOTICE:
Rotate radial tires that have an
asymmetric tread pattern from front
to rear only and not from right to left.