How do I remove the oil pan gasket from my 1999 Cadillac Deville Concours

Answer is.... You will not be able to remove the oil pan with out ruining the oil pan gasket. You may want to buy a new gasket and a about 4 cans of oil before you start. There is a drian plug in that vehical for the engine oil. Not the tranny. Go to a place like PetBoys and get the gasket first, and the oil!. Keep in mind you may want to make sure the oil pump pick up filter is clean' Once you drop the pan you will see the pick up for the pump.
Hope that may help you.

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ASH

Oil Pan REMOVAL & INSTALLATION

1. Before servicing the vehicle, refer to the precautions in the beginning of this section.
2. Drain the crankcase.
3. Remove or disconnect the following:
   • Negative battery cable
   • Oil level indicator harness connector, if equipped
   • Exhaust Y-pipe, if needed
   • Transaxle assembly from the vehicle.
   • Oil pan bolts and the oil pan
   To install: NOTE: The oil pan gasket is reusable unless it is damaged. Do not remove the gasket from the oil pan groove unless gasket replacement is required.
   
4. Thoroughly clean the inside of the oil pan and the cylinder block contact surface. If the oil pan gasket is being reused, be careful not to damage it. Do not expose the gasket to cleaning solvents.
5. If a new gasket is being installed, start the gasket into the oil pan groove and work the gasket into the groove in both directions. Once the gasket is exposed to oil, it will expand and no longer stay in the groove without wrinkles. If this condition exists, replace the gasket.
6. Install or connect the following:
   • Oil pan. Torque the bolts, in sequence, to 89 inch lbs. (10 Nm).
   • Oil level indicator connector, if removed
   • Transaxle assembly, if removed
   • Y-pipe, if removed
   • Flywheel cover, if removed
   • Oil pan drain plug. Torque it to 15 ft. lbs. (20 Nm).
   • Negative battery cable
7. Refill the crankcase.
8. Run the engine and check for leaks. Fig. 1: Oil pan bolt torque sequence