1997 GMC Suburban Owner's Manual - Page 271

Rust or dirt on the wheel, o r on the parts to wheel nuts which it is fastened, can make the become loose after a time. The wheel could come off and cause an accident. When change a you wheel, remove any rust or dirt from the places where the wheel attaches to thevehicle. In an emergency, you can usea 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. 7. Replace the wheel nuts with the rounded end of the nuts toward the wheel. Tighten each wheel nut by hand with the wheel wrench until the wheel is held against the hub. ' A CAUTION: Never use oil grease on studs ornuts. If you or do, the nuts might come loose. Your wheel could fall off, causing a serious accident. 5-31