GMC 2003 Sierra - Manual (Page 470)

4. Remove all tha wheel
ГкЛз and taka oif the
tl^t lira.
Femova any rual ot din
Irom itie lA+ieel bolts,
mounting surfaces
and spare wheel.
Rust or dirt on the wheel, or on ihe parts to
which it ia fastened, tan make the wheel nuta
become loose after a lime. The wheel could
come off and cause an accident. When you
change в wheel, remove any rust or dirt from
the places where the whesl attaches to the
vehicle. In sn 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.
A CAUTION:
Never use oil or grease on studs or nuts. If
you do. the nuts might come loose. Vour wheel
could fall off, causing a serious accident.
5-S5