GMC 2012 Sierra Denali Owner's Manual page 416

10-78 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 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.
7. Put the wheel nuts back on with
the rounded end of the nuts
toward the wheel after mounting
the spare. Tighten each wheel
nut by hand. Then use the wheel
wrench to tighten the nuts until
the wheel is held against
the hub.
8. Turn the wheel wrench
counterclockwise to lower the
vehicle. Lower the jack
completely.