2011 Chevrolet Express 1500 Cargo Owner's Manual - Page 352

10-82 Vehicle Care { WARNING Rust or dirt on a wheel, or on the parts to which it is fastened, can make 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 places where the wheel attaches to the vehicle. In an emergency, a cloth or a paper towel can be used; however, use a scraper or wire brush later to remove all rust or dirt. 6. Remove all the wheel nuts. 7. Take flat tire off of the mounting surface. 8. Remove any rust or dirt from the wheel bolts, mounting surfaces and spare wheel. { WARNING Never use oil or grease on bolts or nuts because the nuts might come loose. The vehicle's wheel could fall off, causing a crash.