2003 Chevrolet Monte Carlo Owner's Manual - Page 310

Rust or dirt on thewheel, or on the partsto 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 brushlater, if you need to, to get all the rust or dirt off. Never use oil or grease on studs or nuts. If you do, the nuts might come loose. Your wheel could fall off, causing a serious accident. 3. Remove any rust or dirt from the wheel bolts, mounting surfaces and spare wheel. 4. Install the compact spare tire. 5. 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. 1 I 5-75