Chevrolet HHR 2010 Owner's Manual page 385

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.
8. Reinstall the wheel nuts with the rounded end of
the nuts toward the wheel. Tighten each nut by
hand until the wheel is held against the hub.
9. Lower the vehicle by turning the jack handle
counterclockwise. Lower the jack completely.
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