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Pontiac 1998 Grand Prix Owner's Manual page 321

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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
to
Check
Use a good quality pocket-type gage to check tire
pressure. You can't tell if your tires are properly inflated
simply by looking at them. Radial tires
may
look
properly inflated even when they're underinflated.
Be sure to put the valve caps back on the valve
stems. They help prevent leaks by keeping out dirt
and moisture.
Tire Inspection and Rotation
Tires should be rotated every 6,000 to 8,000 miles
(10 000 to 13 000
km).
Any time you notice unusual
wear, rotate your tires as soon as possible and check
wheel alignment. Also check for damaged tires or
wheels. See "When It's Time for New Tires" and
"Wheel Replacement" later in this section for
more information.
The purpose of regular rotation is to achieve more
uniform wear for
a l l
tires on the vehicle. The first
rotation is the most important. See "Scheduled
Maintenance Services"
in
the Index for scheduled
rotation intervals.
I
I
I
When rotating your tires, always
use the
correct rotation
pattern shown here.
Don't include the compact spare tire in your
tire rotation.
6-46

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