I have two Deville D'elegance Cadillacs, one a 98 and the other a 99.
I purchased the 99 with 89k and owner though engine head gasket was blown, tested engine, nothing wrong but the thermostat was rusted shut. New thermo, flush and coolant and it runs perfect, better than my 98 and it only has 65k, I can not explain it, the 99 engine is smoother and more powerful.
I would recomend these cars to only someone who is willing to spend money if something goes wrong, its worth every penny when you compare it to modern cars at 50 plus thousand dollars.
Heated seats, power everthing. Very responsive V8 Northstar, great mileage on freeway 26+ MPG but poor in City, about 16 MPG.
and the smooth ride.
Steering wheel column and turning signal is really lame.
Its same setup I had in a 1978 Cutless, should have been updated years before that.