Saturn 2009 ASTRA - Manual (Page 249)

{ CAUTION
Rust or dirt on a wheel, or on
the parts to which it is fastened,
can make wheel bolts 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 9-61.
8. Remove any rust or dirt from the
wheel bolts, mounting surfaces
and spare wheel.
Installing wheels with a good
metal-to-metal contact at
the mounting surface is
necessary to prevent the wheel
bolts from becoming loose.
To prevent corrosion or rust
build-up, apply a light coat of
wheel bearing grease to the
wheel hub center and to the
cone-shaped surface of each
wheel bolt at every wheel change.
9. Place the compact spare tire on
the wheel-mounting surface.
10. Reinstall the wheel bolts with
the rounded end of the bolts
toward the wheel. Tighten each
bolt by hand until the wheel
is held against the hub.
11. Lower the vehicle by turning the
jack handle counterclockwise.
Lower the jack completely.
Vehicle Service and Care 9-65