About engine oil, I will highly recommend to use good quality fully synthetic oil. the recommended is ZIC A+ or KIXX use any of these 5w30 or 0w30 or 0w20 grade. and also buy good quality imported oil and air filters.
If you were in lahore, "filter house" shop would be the best and in pindi , get leppon air filter and if you can find get malaysian imported oil filter. if not then guard filter .
Check the following post in the JDM WagonR thread:
Also you should check the WagonR thread and join and post there too. It will be helpful. You will get a lot of relevant info.