For my experience, overfilling N-CVT oil may result gear box malfunction or damage.
In Cambodia, different oil grade filling or overfilling can cause possible damage.
Due to in here, I can find second hand N-CVT gearbox to change but it not easy. It costs 250 USD per unit which is higher than buying K11's Engine 100 USD.
So Do not trying to overfill or using different oil grade...
rath,