Tensions in the Middle East continued after two vessels from the state-owned Abu Dhabi National Oil Company were attacked while transiting the strait on Thursday, the United Arab Emirates' state news agency WAM said, an incident the UAE government condemned as an Iranian attack.
That brought shipping traffic through the strait to a near standstill on Friday, capping a week where transits fell below the monthly average.
In refining news, U.S. refiners are expected to have 163,000 barrels per day of capacity offline next week, which is similar to estimated offline levels seen this week, research company IIR Energy said on Friday.
Keeping a floor on prices was the widening spread between Brent and U.S. West Texas Intermediate. On Friday the spread widened by 44 cents to last trade at minus $7.07.
A discount over $4 typically encourages export demand.