1997 Cadillac DeVille Owner's Manual - Page 326

After the tires have been rotated, adjust front the and rear inflation pressures shown on the as Tire-Loading Information label. Make certain that all wheel nuts are properly tightened. See "Wheel Nut Torque"in the Index. When It's Time New Tires for One way to tell when it's time for new tires is to check the treadwear indicators, which will appear whenyour tires have only 1/16 inch (1.6 mm) or less of tread remaining. Rust or dirt a wheel, on the parts to which on or it is fastened, can make wheel become loose nuts after a time. The wheel could come and cause off an accident. Whenyou change a wheel, remove any rust or dirt from places where the wheel attaches to the vehicle. In anemergency, youcan use a cloth a paper towel to do this;but be or sure to use a scraper or wire brush later, if you need to, to get all the rust or dirt (See off. "Changing aFlat Tire" in the Index.) You need a new tire any of the following statements if are true: 0 0 0 0 0 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 sidewallis cracked, cut or snaggeddeep enough to show cord or fabric. The tire has a bump,bulge or split. The tire has a puncture, cut or other damage that of can't be repaired well because the size or location of the damage. 6-43