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I have run this car alot, but did not have it out on the road, becasue of no registration or state inspection. I still get alot of smoke when it gets up to operatiing temperature. The plugs look great and there is no coolant smell in the exhaust, Just blue smoke. I just changed out the o2 sensor , because it of it starting to run bad, now it runs great just smking when really hot. I am using no oil or coolant. The engine ran fine out of the donor car, but I did not get it that hot. I have double checked everything and it has to be the cat is full of oil. The previous owner how a huge UIM failure and threw a rod and had oil coming out the tailpipe from thinned oil. SHould I just keep trying to burn this off by running it and holding it at say 1500 RPMs or should I pull the exhaust down? Or can it be something else, etc valve stem seals??? It is a 1995 bonneville sle with a 97 gp engine. Is there anything I can put in the exhaust to break down the oil?? Thanks for your ideas

a good fuel injector cleaner will help lean out the motor and the cleaner exhaust will eventually clear the cat. if thats what the problem is. You should see slight improvements while idling in the driveway each time. Otherwise something else is causing the smoke. How old is the fuel in the tank? When its registered properly, drive it on the interstate up a hill and it should clean out.