Buick 1993 Roadmaster Owner's Manual page 275

When to Check:
Check your tires once .a month or
more.
Don't forget your compact spare-tire (if
SO
equipped). It
should be at 60 psi (420 P a ) .
How to 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.
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.
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