Oil rose for the fourth straight week, supported by signs of a tightening global market that have the International Energy Agency warning of higher prices ahead.
Oil retreated after testing a key technical level, but still held near a five-month high as shrinking US inventories and surging Chinese imports added to signs of a tightening global market.
Oil rose to the highest closing price this year as slowing flows from Russia, production cuts by OPEC+ and falling US inventories pointed to a tightening market.
Oil rose above $81 a barrel, buoyed by general risk-on sentiment, as the first of a spate of supply-and-demand projections scheduled this week forecast a modest rise in US production.