Chevrolet 2000 Express Van Owner's Manual page 247

CAUTION:
Rust or dirt on the wheel, or on the parts to
which it is fastened, can make the wheel nuts
become loose after a time. The wheel could come
off and cause an accident. When you change a
wheel, remove any rust or dirt from the 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 you need to, to get all the rust or
dirt off.
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.
9. Lower the vehicle by turning the jack handle
counterclockwise. Lower the jack completely.
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8. Replace the wheel nuts
with the rounded end of
the nuts toward the
wheel. Tighten each
wheel nut by hand until
the wheel is held against
the hub.
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