bro i dnt think so shell is very good on quality.i used to put it in my fx but not in khyber,or city.i used zic nd its very good for our cars.but now i use havolin formula(not cng).its the best oil i think,after synthetic.
i asked a dealer about synthetic oil.he told me its not fit for the dusty cities like sargodha,so we dnt buy it but otherwise its the best possible oil u can put in ur car.