If any one trys to sell you a Certified Used Cadillac with a Northstar engine - run! Since I have owned my DeVille I have found out that the engine uses oil to the extent of a quart every 1,700 miles and is viewed by GM as NORMAL according to their service bulletins. Therefore, no attempt to correct problem. In addition, I have had two coolant leaks, an engine mount replaced, an electronic control module replaced, both wheel hubs and front bearings replaced, a trunk seal replaced, and the list goes on. Now I undertstand why I got a bumper to bumper extended warranty to 100,000 miles as a certified used car. Unfortunately, it still isn't enough.
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