1993 Cadillac DeVille Owner's Manual - Page 322

' A CAUTION Rust or dirt on a wheeI, or on the parts to which it is hstened, cam make wheel nuts become loose after a time. Tbe wheel could come off and cause an accident. When y ~ change a wheel, n remove any rust or dirt fkom 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 of wire brush later, if you need to, to get all the rust or dirt off. (See %hanging a Flat Tire" in the T- ---* I When It's Timefor New Tires One way to tell when it's time for new tires is to check the treadwear indicators, which will appear when yourtires have only 2/32 inch (1.6 mm) or less of tread remaining. You need anew tire if: 0 You can see the indicators three places around the t ire. at You can see cord or fabric showing through the tire's rubber. The tread or sidewall is cracked, cutor snagged deep enough to show cord or fabric. The tire hasa bump, bulge or split. 309