Subaru 2003 Impreza Owner's Manual page 303

In case of emergency
11. Before putting the spare tire on, clean the
9-12
mounting surface of the wheel and hub with a cloth.
12. Put on the spare tire. Replace the wheel nuts.
Tighten them by hand.
WARNING
Do not use oil or grease on the wheel studs or
nuts when the spare tire is installed. This
could cause the nuts to become loose and
lead to an accident.
13. Turn the jack handle counterclockwise to lower
the vehicle.
14. Use the wheel nut wrench to securely tighten