2003 Buick Century Owner's Manual - Page 278

Rust or dirt or. 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 or dirt 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 brushlater, if you need to, to get all the rust or dirtoff. See "Changing a Flat Tire" in the index. _ . When It Is TimeforNew Tires 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. ~ ~ ~ L You need a new tire if any of the following statements are true: e You can see the indicators at three or more places around the tire. e You can see cord or fabric showing through the tire's rubber. e The tread or sidewall is cracked, cut or snagged deep enough to show cord or fabric. The tire has a bump, bulge or split. e The tire has a puncture, cut or other damage that can't be repaired well because of the size or location of the damage. 5-6 1