EghtesadOnline: Oil prices slipped on Tuesday, extending a heavy sell-off after a surge in the dollar and weighed down by signs of weaker demand in China, the world's second-largest consumer.

EghtesadOnline: Oil bulls grappling with OPEC’s weakened resolve to curb output are also having to worry about waning demand in the world’s biggest buyer of overseas crude.

EghtesadOnline: Oil prices rose on Monday, supported by a slowdown in the growth of rigs looking for crude in the United States and because of strong refinery demand from China.

EghtesadOnline: Oil rose 1 percent on Friday, boosted as U.S. crude producers added only two rigs in the latest week and on signs of increased Chinese demand, but trading was volatile as global supply remained strong.

EghtesadOnline: Oil prices fell on Wednesday as an unexpected build in U.S. crude inventories weighed on markets, along with concerns that Chinese crude demand could falter as Beijing clamps down on alleged tax evasion in the oil industry.