We are lookign at pruchasing a 1999 Cadillac Deville from another person who has kept it well maintained. It has 95,000 miles. Our mechanic told us he had heard there had been problems with this model with the engine having to be replaced around 125,000 miles at a cost of $6,000-$8,000. Our present 1994 cadillac has 350,000 miles, no engine problems (not northstar). Has anyone else heard of problems with the northstar engine in later models? Thank you!