1998 Oldsmobile Achieva Owner's Manual - Page 267

Don't include the compact spare tireyour in tire rotation. After the tires have been rotated, adjust the front and rear inflation pressures as shown on Tire-Loading the Information label. Make certain that wheel nuts all are properly tightened. See "Wheel Torque" in Nut the Index. When It's Timefor New Tires One way to tellwhen it's time fornew 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. Rust or dirton a wheel, or on the parts to which it is fastened,can make wheel nuts become loose after a time. The wheel could come and cause off an accident. When you change wheel, remove a any rust or dirt from places wherethe wheel attaches to the vehicle. In anemergency, youcan use a cloth or a paper towel to do this; but be sure to a scraper orwire brush later, if you use need to, to get a l the rust or dirt (See l off. "Changing a Flat Tire" inthe 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 showcord 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. 0 0 6-39