Buick 1993 Skylark Owner's Manual page 244

When to Check:
Check your tires once a month or
more.
Don't forget your compact spare tire. It should be at 60
psi (420 P a ) .
How
t c o
Check: Use a good quality pocket-type gage to
check tire pressure. Simply looking at the tires will not
tell you the pressure, especially if
you
have radial tires
--
which may look~properly inflated even if they're
underinflated.
1
If your tires have valve caps, be sure to put them back
on. They help prevent leaks~ by keeping out dirt and
moisture.
Tire Inspection and Rotation
To make your tires last longer, have them, inspected and
rotated at the mileages recommended in the
Maintenance Schedule. See "Scheduled Maintenance
Services" in the Index.
Use this rotation pattern.
After the tires have been rotated, adjust the front and
rear inflation pressure as shown on the Tire-Loading
Information label. Make certain that all wheel nuts are
properly tightened. See "Wheel Nut Torque" in the
Index.
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