2009 Pontiac G8 Owner's Manual - Page 284

9-80 Vehicle Service and Care { 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 9-75. { CAUTION Never use oil or grease on bolts or nuts because the nuts might come loose. The vehicle's wheel could fall off, causing a crash. 12. Reinstall the wheel nuts with the rounded end of the nuts toward the wheel. Tighten each nut as much as possible using the wheel wrench until the wheel is held firmly against the hub. Use your free hand to prevent the wheel from turning while you are tightening. 10. Remove any rust or dirt from the wheel bolts, mounting surfaces and spare wheel. 11. Place the compact spare tire on the wheel-mounting surface.