Zic is best , havoline is reliable and also tested personally on my own car , car almost driven more than 90K and till no now oil consumption/smoke,,,,,,,,,,,,,,,,cant trust on shell ,,,,,,,,,,,,my friend who deal in oil told me that pak shell some times buy bulk oil from market and pack them in there own company and sell in market,,,,,,,,,,,,,,,atleast i cant trust on pak made shell