1997 Saturn SL2 white smoke

First of all thank you so much for the donation. First thing make sure the oil isn't over full because if it is it will smoke. Also is the smoke heavy does it stay low and kind of hover around?That's what oil out the tail pipe does what o2 sensor did you replace the one in the exhaust manifold or the one by the cat?What was the number of the code you were getting?

When you reach 4,000 rpm's the rev limiter kick's if your in neutral or park that's normal I forgot to mention that earlier. So does your o2 code come back since you replace the o2 sensor?Is your egr code current meaning if you clear it does it set again?Also if you could get me the code number that would be great a lot of those sensor's or valve's have more then one code for them. With different meaning's and diagnoses trouble tree's. You never told me if your oil was over filled?Black smoke is fuel blue smoke is oil and white smoke is usually coolant. Are you sure the smoke coming out isn't steam or coolant?

To lower the oil level you would go under the car and on the drain pan you will find a drain plug it should be 14mm if it's it's the factory one. Remove it for a second or two and see what the level is at then.I would try that then drive the car for a little while and see if the smoke clear's up. Are you saying the smoke only happens when you first start it up after it sits?Then goes away after it run's a little while?

Sounds like your burning oil so was the smoke ever there before your last oil change or did it all start with your last oil change?I would also set the oil level to the correct level and see how it goes from there out.

Let me know sound's like they did something if it never smoked before the oil change. You didn't switch to synthetic oil this oil change did you?