1993-2005 Cadillac Seville/ Eldorado/ Allante/ Deville have the 32V Northstar engine built by GM. These engines are prone to leaking oil, and having the head bolt threads pull from the engine
block. I was with the GM Cadillac Division at the dealer for 13 years and specalized in this repair. I offer a 18 month unlimited mileage warranty on the head gasket repair and oil any oil leaks
addressed. I have completed 278 head gasket jobs and a half dozen engine overhauls. I have 3 pages of references from Indianapolis to Rhode Island so don't hesitate to call me and ask. Cadillac
Northstar head gasket repair takes 2-3 days and I will also reseal the lower bearing case. I use STUDS from CCC or Northstar performance or NS300L, stud install price with lower bearing case reseal
The cooling systems in these cars is very critical and there is no need or way to fix a bad head gasket on Cadillac Northstar without it being repaired. Never and I repeat use Thermogasket, Bluedevil or stop leak additives for your Cadillac Northstar, it's only going to cause more problems.