Asociația Clubul Sportiv Petrolul 52 , commonly known as FC Petrolul Ploiești ( Romanian pronunciation: [peˈtrolul ploˈjeʃtʲ] ), Petrolul Ploiești , or simply Petrolul , is a Romanian professional football club based in Ploiești , Prahova County . It competes in the Liga I , the top tier of the Romanian league system .
