TeXXo selling brand for FULLY SYN 5W40

mobil1, Shell, Castrol, Total..

recently new brand added such as Elf, Repsol....

price range from Rm139 to rm200.

however, it seem like alot foreman say those ARE
Old oil (mfg 2013-14),
heavy oil (xW40),
maybe fake oil (not from local distributor),
API SM (newest is SN),
etc

any suggestion to hamtam balik...>.<