The recommended oil for 1KR-FE engine is 0W20. But due to hot weather in Pakistan, use 0W30 (you can find this grade in Zic). Ensure that it is API SN / ILSAC GF-5 for gasoline engines. Zinc and phosphorus in oil should be not more than 800 ppm.
You can also use 5W30. But 0W30 is better. If your vehicle has done 100,000 KM, then you may use 5W30 year round.