This oil being api sn has lower zinc levels. high Zinc levels are required for flat tappet engines such as mehran, cuore, alto, cultus 2008-2017, margalla, baleno and other old school engines. You cultus 2002 uses hydraulic lifters a.k.a dabboo which do not require zinc hence you could use the latest spec oil i.e. api sn.
However, I have doubts about the fully synthetic claim since there are places where they have mentioned it to be semi synthetic and then at some places they claim it to be fully synthetic