2011 Chevrolet Impala Owner's Manual - Page 326

10-70 Vehicle Care { WARNING 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 changing a wheel, remove any rust or dirt from places where the wheel attaches to the vehicle. In an emergency, 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 If a Tire Goes Flat on page 10‑65. 7. Remove any rust or dirt from the wheel bolts, mounting surfaces, and spare wheel. 8. Install the compact spare tire. 9. Reinstall the wheel nuts with the rounded end of the nuts toward the wheel. Tighten each nut clockwise by hand until the wheel is held against the hub. { WARNING 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.