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When you say, "CLANK. DEAD. NOTHING!", can you be a little more specific? Was the car idling fine and then cut out with no sputtering or stumbling? When you checked the oil after this failure, did you notice any metal particles in the oil? If you have a flashlight, shine it on the dipstick and see if any metal particles are in the oil.
Sometimes when you get a major failure, the motor will not lock up. If I were you, I would find a good Cadillac dealership and have your car towed there. I have found, through extensive dealership visits with my Camaro, that Caddy dealers do a far better job.
Best of luck.
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