MANILA – Oil companies will implement price rollback effective morning of August 4. In separate advisories, Chevron (Caltex), Cleanfuel, Flying V, Petro Gazz, Seaoil and Shell said they will cut diesel prices by PHP0.30 per liter and PHP0.25 per liter on gasoline prices. Chevron, Flying V, Seaoil, and Shell will also reduce kerosene prices by PHP0.15 per liter.