By Eric Yep 
 

Oil prices were marginally higher in Asian trade Wednesday, attempting a rebound after sharp losses of nearly 3% in the previous session on the back of a strong U.S. dollar.

On the New York Mercantile Exchange, light, sweet crude futures for delivery in July traded at $58.35 a barrel at 0324 GMT, up $0.32 in the Globex electronic session. July Brent crude on London's ICE Futures exchange rose $0.15 to $63.87 a barrel.

However, strength in the greenback continues to weigh on oil prices. Market participants have raised concerns about the inability of the oil market to sustain its latest price rally.

"At least for the time being, the strength in the U.S. dollar has called attention away from declining U.S. petroleum inventories," analyst Tim Evans at Citi Futures said.

He said while the upcoming meeting of the Organization of the Petroleum Exporting Countries in early June will drive oil market balances, there's no question that recent oil price movement has been tied to swings in the U.S. dollar.

"When the dollar is strong, the dollar is the preferred store of value. But when the dollar is weak, money managers would rather hold commodities, all else being equal," Mr. Evans said.

The U.S. dollar index has rallied for three consecutive sessions and is at its strongest in a month due to Greece debt default concerns and higher U.S. interest rates expected later this year.

Traders continue to watch developments in the Middle East and oil demand-supply indicators for more cues, especially since the market is divided over the near-term direction of oil prices.

One of the key supports for oil prices in the first quarter of this year was a surge in speculative net long positions, or bets that prices will rise, in Brent crude.

But a sharp decline recently in speculative positions in Brent could indicate a shift towards bearish sentiment, and further unwinding of these positions would remove a key pillar of support to oil prices, analysts at BMI research said.

In the week ending May 19, net long positions of money managers fell for the second consecutive week by 13.4%, the sharpest pullback since July 2014.

"In our view, a rapid liquidation of long positions in the Brent futures market would likely trigger a downswing in the price," BMI said. It expects Brent crude to average $59 a barrel for 2015.

Nymex reformulated gasoline blendstock for June--the benchmark gasoline contract--rose 14 points to $1.9997 a gallon, while June diesel traded at $1.8999, 3 points lower.

ICE gasoil for June changed hands at $584.75 a metric ton, down $0.50 from Tuesday's settlement.

Write to Eric Yep at eric.yep@wsj.com