ISLAMABAD : Prices of various petroleum products are likely to increase by up to Rs 4 per liter from October 01. The rise is expected because of rising oil prices in the international markets wherein crude oil prices have risen to $114 per barrel from $111 per barrel. In the local market, petrol prices are likely to up by Rs4 per liter, kerosene oil by Rs2.50 per liter, diesel by Rs2 a liter and light diesel oil by Rs2.15 a liter. Ogra will send the final summary on Sept 29 to the ministry for approval in this regard.