Wa Alaikum Salam. Brother you haven't mentioned which engine oil grade of ZIC you are using?
Still, as you have mentioned that engine health is perfect, I would recommend to use Total Quartz 9000 Future Series 5w-30 (preferably after engine flush) instead of ZIC and always pour in the quantity mentioned in the car's owners / users manual.
Please see, how much quantity of engine oil is reqd.?, and then pour in the recommended engine oil quantity.
To me, it seems as if the engine oil is fake, or you are pouring in less engine oil quantity i.e. engine oil is underfilled.