Now that's the main issue and big concern.
Any fully synthetic, premium category, like "TOP" Series (most expensive in the current series, available locally here), and then "X9" series may be good for 6-7,000 Kms, but does not mean that its engine oil grade is also recommended for your car.
If you are gonna pour ZIC TOP 0w-40 in Corolla (where 5w-30, 10w-30 are the recommended engine oil grades), then even its premium, fully synthetic oil, good for 6-7,000 Kms, but will not be suitable for Corolla, and may misbehave.
On paper 10w-30 and 0w-40 may not make much difference, as far as Kinematic Viscosity is concerned, but in reality and practically, there is lots of difference.
There are reasons that engine oil grades are the criteria, and not the kinematic viscosity at 40 Celsius and 100 Celsius'
(Details regarding different series and grades by ZIC for Gasoline and Hybrid Engines for Passenger Cars are available at: http://zicoil.pk/product-category/gasoline-hybrid If you would like see for your self, you may visit the link)