1. If there are more bluish smoke during cold or warm start, it might be the valve stem seal broken.
2. If the bluish smoke reduced after car is warm up, perhaps the piston ring or the cylinder is faulty.
3. It might be single cylinder faulty if the bluish smoke is seen with pulsating pattern.
Suggest to diagnose at workshop:
1. Repair the valve cover or cylinder base on judgement, replace the faulty part and restore the cylinder.
2. Restore the engine power and re-perform the engine run-in