2003 Oldsmobile Silhouette Owner's Manual - Page 370

After the tires have been rotated, adjust the front and rear inflation pressures as shown the Certification/Tire on label. Make certain that all wheel are properly nuts tightened. See "Wheel Nut Torque" under Capacities and Specifications on page 103. 5- When It Is Time for New Tires One way to tell when it's time for new tires is to check the treadwear indicators, which will appear when your tires have only 1/16 inch (1.6 mm) or less of tread remaining. -3ust or dirt on a wheel, or on the parts to which it is fastened, can make wheel nuts become loose after a time. The wheel could come off and cause an accident. When you change a wheel, remove any rust ordirt from places where the wheel attaches to the vehicle. In an emergency, you can use a cloth or a paper towel to do this; but be sure to use a scraper or wire brush later, if you need to, to get all the rust or dirtoff. See "Changing a Flat Tire" in the Index. __ You need a new tire if any of the following statements are true: You can see the indicators at three or more places around the tire. You can see cord or fabric showing through the tire's rubber. The tread or sidewall is cracked, cut or snagged deep enough to show cord or fabric. The tire has a bump, bulge or split. The tire has a puncture, cut or other damage that can't be repaired well because of the size or location of the damage. 5-63