Crude oil has inched, it is higher by 5 dollars per barrel

New Delhi: Crude oil has gained for the fourth session in a row as a sliding dollar has encouraged investors to buy commodities. Tension in Russia and worries that a tropical storm might re-enter the Gulf of Mexico has also supported the crude rally.

Thursday's rally has left analysts divided, with some calling a temporary spurt, while others - notably those at long-time oil bull Goldman Sachs - saying market fundamentals point to firm prices. MF Global analyst, Edward Meir said the $6 rise on Thursday was probably a dead cat bounce, a technical expression that denotes a brief rally in a falling market.

Prices were also weighed down by evidence of rising OPEC supplies. Industry consultant Petrologistics said on Friday OPEC oil output is expected to rise in August by 4.5 lakh barrels per day (bpd) to 32.95 million bpd due to higher supply from Iran and Angola.

However, oil has recovered around $9 from last Friday's four-month low, ending a dramatic slide of more than $35 from the record high of $147.27 a barrel hit on July 11 that was triggered by worries about slowing global demand.

Oil has been boosted by rising tension between Russia and the West over Moscow's actions in neighbouring Georgia, which has once again highlighted the oil market's vulnerability to any supply disruptions. Russia's conflict with Georgia has already disrupted the transit of Azeri oil through the region, and traders fear the situation could worsen.

Russia, the world's second-largest oil exporter, said on Thursday it would respond with more than just a diplomatic protest to a US deal with Poland to station parts of a US missile defence shield on Polish soil.

A steep fall in the dollar on Thursday amid worries of wider credit-related losses at some US financial firms saw investors reinstating their long-commodities/short-dollar positions, driving prices across a raft of commodities higher.

The dollar limped up on Friday after suffering its biggest daily drop in five months a day before. The US greenback had touched an eight-month high earlier this month. Dealers are also beginning to weigh up possible Organization of the Petroleum Exporting Countries policy at its meeting on September 9.