India's Hindustan Petroleum Corporation Limited (HPCL) will ask Saudi Arabia for extra crude in August, a source at the state-run refiner said following others in the energy-hungry Asian giant who have grasped the Opec member's offer to boost supply.

Three refiners asked for an extra 2.6 million to 2.7 million barrels for July from Saudi Arabia, which decided to offer the extra oil unilaterally after Opec last month failed to agree any new output deal.

'During the rainy season our consumption of Arab Extra Light goes up at the Mumbai refinery because it gives a higher volume of fuel oil. Demand for asphalt declines during the time,' the source said.

HPCL's annual deal with Saudi Arabia is for 35,000 barrels per day of crude.

Saudi state company Aramco has already cut prices of its crude to Asian clients for August. 'If they have cut the prices, we would like to have more,' the source said.

Concerns over high energy costs that could damage the fragile global economy prompted major consuming nations to agree to release oil from emergency stocks last month.-Reuters