These small Japni cars are designed to take the less viscose oils.
Any oil starting with 10W would not give you the fuel economy.
The best choice would be
ZIC X7 FE 5w-20 (Formerly ZIC A+ 5w-20)
ZIC X7 FE 0w-30 (Formerly ZIC OW 0w-30)
You can keep the change interval upto 6K for these oils because these are fully synthetic.
However, make sure you are buying the original products which is most important of all.