Do you have an owner's manual with your car? If you do, it is mentioned in the manual which oil to use. Get in the habit of reading and following manufacturers guidelines rather than asking here and there. If your Mehran's overhaul was done correctly, then you need the same oil your car used when it came out of the factory.
If you don't have an owners manual, go to the Pak Suzuki 3S workshop and ask them;). In the mean time get a photocopy of the manual