Buick 1994 Roadmaster Owner's Manual page 259

When to Check
Check your tires once a month or more. Also, check the
tire pressure of the spare tire.
If you have a compact spare tire, it should be at 60 psi
(420 kPa).
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.
FRONT
Use this rotation pattern.
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