2003 Chevrolet Impala Owner's Manual - Page 330

3. Remove any rust or dirt from the wheel bolts, mounting surfaces and spare wheel. r Never use oil or greaseon studs or nuts. If you do, the nuts might come loose. Your wheel could fall off, causing a serious accident. 4. install the compact spare tire. Rust or dirt on thewheel, or on the parts to which it is fastened, can make the wheel nuts become loose after a time. The wheel could come off and cause an accident. When you change a wheel, remove any rust ordirt from the 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 you need to, to get all the rust or dirtoff. 5-77