Zafira B 1.9CDTI - 1.9cdti Engine Oil increasing - Zafira B 1.9cdti

Hello,

I have got a Zafira B. I'm facing a strange problem, the engine oil level is more than MAX level (about 1cm above MAX level). I send to garage and drain 0.5 lit of engine oil, after that, the oil level is around MAX level. After 200KM running, check oil level again, the level is again at 1cm above MAX level. I have no idea what is happening to my car. The car is running smoothly without any abnormality like knocking sound, smoke and etc. The coolant level is well maintained.

Appreciate your help.