2008 Chevrolet Cobalt Owner's Manual - Page 321

{CAUTION: Rust or dirt on a wheel, or on the parts to which it is fastened, can make wheel nuts become loose after 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 brush later, if needed, to get all the rust or dirt off. See Changing a Flat Tire on page 5-74. 11. Remove any rust or dirt from the wheel bolts, mounting surfaces, and spare wheel. Reinstall the wheel nuts with the rounded end of the nuts toward the wheel. Tighten each nut by hand until the wheel is held against the hub. 12. Lower the vehicle by turning the jack handle counterclockwise. Lower the jack completely. 10. Place the compact spare tire on the wheel-mounting surface. {CAUTION: Never use oil or grease on studs or nuts. Because the nuts might come loose. The vehicle's wheel could fall off, causing a crash. 5-83