No, the engine doesn't have to come out.
No
what size motor?
Do I have to pull the motor to change the oil pan gasket on my 1985 buick rivieria?
Typically, yes.
No.
you don't have to but it is tight in there.
You can change a head gasket if that is all that is wrong.
Depends on the engine, but most of the time it is not required.
yes. because it is front wheel drive, you also have to remove the transmission
If you drive with no antifreeze in your radiator you could ruin the motor. At a minimum you would probably blow a head gasket. The worse thing that can happen is that the motor will freeze up.
its about as bad as pulling the motor undo the mounts hoses wiring anything that will get to tight and raise motor up enough to remove the pan to replace gasket
No.