2003 Buick Century Owner's Manual - Page 290

7. Remove any rust or dirt from the wheel bolts, mounting surfaces and spare wheel. 5. Raise the vehicle by turning the jack handle clockwise. Raise the vehicle far enough off the ground for the spare compact tire to fit underneath the wheel well. 6. Remove all wheel nuts and take off the flat 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 or dirt 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 dirt off. 5-73