After 5 days on Google I found right oil for my new Suzuki Swift 2013.
Mobil 1 Super Synthetic
SAE 5W-50
API SN
RESULT OF 5 DAYS GOOGLE SEARCH
SAE (X)W-30 Oils can provide good lubrication at maximum temparature of 37'C.
SAE (X)W-40 Oils can provide good lubrication at maximum temparature of 43'C.
SAE (X)W-50 Oils can provide good lubrication at maximum temparature of 55'C.
So according to temparature of Lahore, Faisalabad, Multan etc we should use (X)W-50 engine oil.
People of Karachi can use (X)W-30 or (X)W-40 engine oils
REMEMBER:
Always use fully synthetic or 100% synthetic engine oil becuase they are best.
Synthetic blend, Synthetic Formula and other such types of oils are mixture of synthetic and mineral oils. But they are not fully synthetic.