Drain the old oil out, change the oil filter, and fill up with FHS SmokeLess oil. Results should be almost immediate
If the car is still smoking, let it run for about 15 minutes. After 15 minutes your car should stop smoking as long as you use FHS SmokeLess oil
Note Smokeless is an oil, not an additive. If you mix it with other oils you will get smoke
You also need to change the oil filter, as old oil can get trapped in the filter
Reduced odds of stopping smoke in diesel and turbos