Cadillac 2008 DTS Owner's Manual page 377

8. Raise the vehicle by turning the jack handle
clockwise. Raise the vehicle far enough off the
ground for the spare tire to fit under the vehicle.
9. Remove all wheel nuts and the flat tire.
5-82
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 5-77.
10. Remove any rust or dirt
from the wheel bolts,
mounting surfaces,
and spare wheel.