As per https://www.amsoil.com/international/distributor/Countries/Pakistan.aspx , following details are available regarding official and authorized dealers for Amsoil in Pakistan:
International Distributors: Pakistan
Javid Enterprises
AAMIR YASEEN
Sheikhupura Road, Behind Sui Gas Office
Gujranwala- Pakistan 52250
Office: 055-4443767, 4442337
Mobile Phone: 03065848184
xs4aamir@yahoo.com
Javid Enterprises is committed to serve its customers with the best quality products with highest performance while keeping it cost effective to increase automotive engine, equipment performance, and life along with reducing downtime to result in an increase in production process and saved money.
(The information is first hand and coming straight from Amsoil)
If someone is interested in Amsoil, and that oil meets / exceeds OEM requirements, then I think there is no harm in using it; one's money, one's choice. However, before buying, he must ensure that oil is genuine and bought from authorized dealer / distributor (in case of any query or doubt, it can be confirmed from details mentioned above). Secondly, the drain interval must be as per OEM guidelines, instead of engine oil manufacturer.