1993 Pontiac Bonneville Owner's Manual - Page 220

I CAUTION If you let your tires spin at high speed, they can explode and you or others could be injured. And, the transaxle or other parts of the vehicle can overheat. That could cause an engine compartment fire or other damage. When you're stuck, spin the wheels as little as possible. Don't spin the wheels above 35 mph (56 km/h) as shown on the speedometer. Spinning your wheels can destroy parts of your vehicle as well as the tires. If you spin the wheels too fast while shifting your transaxle back and forth, you can destroy your transaxle. Rocking Your Vehicle to Get it Out: First, turn your steering wheel left and right. That will clear the area around your front wheels. Then shift back and forth between R (Reverse) and a forward gear, spinning the wheels as little as possible. Release the accelerator pedal while you shift, and press lightly on the accelerator pedal when the transaxle is in gear. If that doesn't get you out after a few tries, you may need to be towed out. If you do need to be towed out, see the Index under Towing Your Pontiac.