Chevrolet 2012 Colorado Owner's Manual page 327

8. Remove any rust or dirt from the
wheel bolts, mounting surfaces
and spare wheel.
9. Install the spare tire.
Never use oil or grease on bolts
or nuts because the nuts might
come loose. The vehicle's wheel
could fall off, causing a crash.
10. Put the wheel nuts back on
with the rounded end of the
nuts toward the wheel. Tighten
each wheel nut by hand. Then
use the wheel wrench to
tighten the nuts until the wheel
is held against the hub.