Oil stocks rally on news of probe

Investigation of Zhou Yongkang buoys market

Oil shares rallied amid a dip in the benchmark on Wednesday after Beijing announced that a retired party leader with close ties to the industry was under investigation.

The oil sector gained an average of 4.95 percent, the highest of all sectors. The benchmark Shanghai Composite Index lost 0.09 percent to 2181.24 points, breaking a six-day winning streak.