Buick 2001 Century Owner's Manual page 245

CAUTION:
Never use oil or grease on studs or nuts. If you
do, the nuts might come loose. Your wheel could
fall off, causing a serious accident.
8. Install the spare tire.
5-28
Put the wheel nuts back
on with the rounded end
of the nuts toward the
wheel. Tighten each nut
by hand until the wheel
is held against the hub.
9. Lower the vehicle by turning the jack handle
counterclockwise. Lower the jack completely.