GMC 2009 Sierra - Manual (Page 401)

{ CAUTION:
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
you change a wheel, remove any rust or
dirt from 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 needed, to get all the rust or dirt
off. See Changing a Flat Tire on page 5-81.
6. Remove any rust or dirt
from the wheel bolts,
mounting surfaces
and spare wheel.
{ 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 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.
5-89