1999 Buick Riviera Owner's Manual - Page 226

yellowblue 11. Using the wheel wrench, tighten the wheel nuts firmly in a criss-cross sequence as shown. CAUTION: 10. Lower the vehicle by turning the wheel wrench counterclockwise. Lower the jack completely. Incorrect wheel nuts or improperly tightened wheel nuts can cause the wheel to become loose and even come off. This could lead to an accident. Be sure to use the correct wheel nuts. If you have to replace them, be sure to get new GM original equipment wheel nuts. Stop somewhere as soon as you can and have the nuts tightened with a torque wrench to 100 lb-ft (140 N·m). 5-24