1997 Buick LeSabre Owner's Manual - Page 239

Getting undera vehicle when itis jacked up is dangerous. If the vehicle slips off the jack,you could be badly injured or killed. Never get under a vehicle when it is supported only by a jack. 4. Position the jack and raise the jack head until it fits firmly on the ridge in the vehicle's frame nearest the flat tire. Do not raise the vehicle yet. Put the compact spare tire near you. Raising your vehicle with the jack improperly positioned can damage the vehicle and even make the vehicle fall. To help avoid personal injury and vehicle damage, be sure to fit the jack lift head into the proper location before raising the vehicle. 5-29