1998 Pontiac Grand Prix Owner's Manual - Page 320

CAUTION: (Continued) NOTICE: Don't let anyonetell you that underinflationor overinflation is all right.It's not. If your tires don't have enoughair (underinflation), you can get the following: 0 Too much flexing Too much heat Tire overloading Bad wear Bad handling Bad fuel economy. If your tires have much air (overinfla.tion), too you can get the following: Unusual wear Bad handling Rough ride Needless damage from road hazards. Underinflated tires pose the same danger as overloadedtires. The resulting accident could cause serious injury. Check all tires frequently to maintain the recommended pressure. Tire pressure should be checked when your tires are cold. Overinflated tires are more likely to be cut, puncturedor broken by a sudden impact such as when you hit a pothole. Keep tires at therecommended pressure. Worn, old tires can cause accidents. If your tread is badly worn, or if your tires have been damaged, replacethem. -- Inflation -- Tire Pressure The Tire-Loading Information label, which on the is inside of the trunk lid, shows the correct inflation pressures for your tires when they're cold. "Cold" means your vehicle has been sitting at least three for hours or driven no more than 1 mile (1.6 km). 6-45