1993 Buick Century Owner's Manual - Page 216

I A CAUTION: Never use oil or grease on studs or nuts. If you do, the nuts might come loose. Your wheel could falloff, causing a serious accident. c m 7. Replace 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. 8. Lower the vehicle by rotating the wheel wrench counterclockwise. Lower the jack completely. 214