GMC 2012 Terrain Owner's Manual page 354

10-72 Vehicle Care
WARNING
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
changing a wheel, remove any
rust or dirt from places where the
wheel attaches to the vehicle.
In an emergency, a cloth or
a paper towel can be used;
however, use a scraper or wire
brush later to remove all rust
or dirt.
11. Remove any rust or dirt from
the wheel bolts, mounting
surfaces, and spare wheel.
12. Place the compact spare tire
on the wheel-mounting surface.
WARNING
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.
13. Reinstall the wheel nuts.
Tighten each nut by hand
until the wheel is held against
the hub.
14. Lower the vehicle by
turning the jack handle
counterclockwise.