GMC Sierra Denali Owner's Manual page 349

5. Remove any rust or dirt
from the wheel bolts,
mounting surfaces
and spare wheel.
Never use oil or grease on studs or nuts.
It
you do, the nuts might come loose. Your wheel
could fall off, causing a serious accident.
6. After mounting the
spare, put the wheel
nuts back on with
the rounded end
o f
the
nuts toward the
wheel. Tighten each
wheel nut by hand.
Then use the wheel
wrench until the wheel
is held against
the hub.
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