2007 GMC Acadia Owner's Manual - Page 466

{CAUTION: Rust or dirt on the wheel, or on the parts to which it is fastened, can make the 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 the places where the wheel attaches to the vehicle. In an emergency, a cloth or a paper towel can be used to do this; but be sure to use a scraper or wire brush later, if needed, to get all the rust or dirt off. {CAUTION: Never use oil or grease on studs or nuts. Because the nuts might come loose. The vehicle's wheel could fall off, causing a serious accident. 10. Remove any rust or dirt from the wheel bolts, mounting surfaces, and spare wheel. 11. Install the compact spare tire. 12. Lower the vehicle by attaching the lug wrench to the jack and turning the wrench counterclockwise. Lower the jack completely. 466