1998 Pontiac Grand Am Owner's Manual - Page 276

How to Check NOTICE: Don't let anyone tell that underinflation or you overinflation is all right. It's not. If your tires don't have enough (underinflation), you can air get the following: 0 T o much flexing o 0 T o much heat o Tire overloading Bad wear 0 Bad handling Bad fuel economy. If your tires have too much air (overinflation), you can getthe following: Unusualwear Bad handling 0 Rough ride 0 Needless damage from road hazards. When to Check Check your tires once amonth or more. Use a good quality pocket-type gage to check tire pressure. You can't tellif your tiresare properly inflated may simply by looking at them. Radial tires look properly inflated even when they're underinflated. the Be sure to put valve caps back onthe valve stems. They help prevent leaks keeping out dirt by 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 possible and check as wheel alignment. Also check damaged tires or for wheels. See "When It's Time New Tires" and for in "Wheel Replacement" later this sectionfor more information. The purposeof regular rotation is to achieve more uniform wearfor all tires on the vehicle. The first rotation is the most important. "Scheduled See Maintenance Services" in Index for scheduled the rotation intervals. tire. Don't forget your compact spare It should be at 60 psi (420 Wa). 6-43