Pontiac 2008 G5 Owner's Manual page 315

CAUTION:
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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 5-72.
11. Remove any rust or dirt
from the wheel bolts,
mounting surfaces, and
spare wheel.
12. Place the compact spare tire on the wheel-mounting
surface.
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.
13. Reinstall the wheel nuts with the rounded end of
the nuts toward the wheel. Tighten each nut by
hand until the wheel is held against the hub.
14. Lower the vehicle by turning the jack handle
counterclockwise. Lower the jack completely.
5-81