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Pontiac 1997 Grand Prix Owner's Manual page 316

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I
NOTICE:
Don't let anyone tell you that underinflation or
overinflation is all right. It's not. If your tires
don't have enough air (underinflation), you can
get
the following:
0
Too much flexing
0
Too much heat
0
Tire overloading
0
Bad wear
Bad handling
Bad
fuel
economy.
If your tires have too much air (overinflation),
you
can get the following:
Unusual wear
Bad handling
Rough ride
Needless damage from road hazards.
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 kPa).
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.
6-46

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Grandprix 1997