Oil prices ease as worries over global economic slowdown weigh

"The market will likely continue to move back and forth for some time, focusing on economic indicators in China and monetary policy by central banks," he said, predicting Brent would trade around $75 a barrel.

Saudi Arabia, the world's biggest crude exporter, on Monday said it would extend its voluntary output cut of 1 million barrels per day (bpd) to August, while Russia and Algeria volunteered to lower their August output and export levels by 500,000 bpd and 20,000 bpd, respectively.

The move only briefly lifted the market. The latest decision by Saudi and Russia could be viewed as a bearish signal for prices, as it confirms that optimistic views on demand growth are faltering.

OPEC+, a group comprising the Organization of the Petroleum Exporting Countries and allies including Russia that pumps around 40% of the world's crude, has been cutting oil output since November in the face of flagging prices.

Investors remained concerned about oil demand, however, after business surveys showed a slump in global factory activity because of sluggish demand in China and in Europe.

Traders will be looking for demand cues from industry data on U.S. crude and product inventories from the American Petroleum Institute later on Wednesday and government data on Thursday, both delayed by a day due to the U.S. holiday.

U.S. crude inventories were expected to fall by about 1.8 million barrels in the week to June 30, which would mark a third straight week of declines, four analysts polled by Reuters forecast.