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there are multiple things that can burn to cause smoke
1) moisture - usually white. Can simply be due to mosture in the engine burning off in the morning. This will be more common with vehicles that are only used for short trips or those that are left idlinig for long periods. Taking the vehicle for a long, high speed run can burn of a lot of this moisture.
2) coolant - usually white. Would indicate a serious engine issue. this can be tested for chemically but usually if this was the cause you would have bigger issues such as overheating, etc.
3) excess fuel - usually greyish. this is from too much fuel being used which can be due to a faulty temp sensor, airflow sensor, or leaking injectors
4) oil - usually white/blue. this is from oil leaking into the cylinders and burning off when the vehicle. most commonly this would be leaking valve seals.
so, at this time, you will need to determinie what it is that is burning to cause the smoke, and then determine the source of it. I would say most likely it is leaking valve seals causing oil to burn. This can be tested for with a leak down test. fixing this will require the seals be replaced.
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yes the valve seals is a big job.
oil leaking under the car does not cause smoke out the tail pipe so this is not relevant.
you can try taking it for a long, hot run, see if that helps.
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