China’s leaders are deepening their probes into China’s distressed oil sector as the nation’s top refiner faced new scrutiny on Monday, illustrating the staying power of an antigraft drive that has shaken China’s powerful state-owned enterprises. China’s antigraft authority is taking aim at Sinopec Group, a lynchpin of China’s economy that in recent years stood as a symbol of its global oil ambitions. Accusations against a top company executive are likely to add to what have been several years of uncertainty in China’s oil sector, which has already curtailed spending at home and slowed investment abroad partly as a result of unprecedented government scrutiny. The Communist Party’s Central Commission for Discipline Inspection said in a notice late Monday that Wang Tianpu , president of state-owned oil-and-gas company Sinopec Group, […]