U.S. President Donald Trump has not shown any signs of easing attacks on Iran. He warned the U.S. may hit Iran's Pickaxe Mountain near its heavily damaged Natanz uranium enrichment facility, but said he thought the war would end immediately after the November midterm elections.
Elsewhere, China's state planner said on Friday it will raise retail price caps on petrol and diesel from September 12 by 260 yuan ($38.76) and 250 yuan per metric ton, respectively.
Middle East shipping risks keep volatility high
The benchmarks pared all early gains to trade lower after the Financial Times reported that foreign ministers in the Middle East are trying to work out a temporary deal with Iran to manage shipping through the Strait of Hormuz.
"Some headlines of possible new talks in the Middle East are weighing moderately on oil prices today," said UBS energy analyst Giovanni Staunovo, adding: "I keep seeing near-term risks to the upside for oil prices, but we should expect ongoing high price volatility too".
Iran said it had attacked 10 ships near the Strait of Hormuz on Wednesday, after the U.S. hit five Iranian oil tankers. Iran's Islamic Revolutionary Guard Corps said it would escalate its response to any further attacks.
Vessel transits at the Strait of Hormuz fell to seven on Thursday from 11 the previous day, preliminary ship-tracking data showed on Friday, well below the 10-day average of 15.
The Strait of Hormuz handled about one-fifth of global daily oil and liquefied natural gas supplies before the Iran war began in late February.
Iran-aligned Houthis seized control of Yemen's port of Mocha on Thursday, posing a further threat to Red Sea traffic, while Gulf traffic remains restricted through the Strait of Hormuz as tanker attacks in the region have intensified in recent days.
Attacks from Yemen on Saudi energy facilities marked an escalation beyond Iran and the Strait of Hormuz and raised fears of prolonged disruptions in the broader region, analysts say.
Oil prices ease but stay on track for weekly gains
Brent crude futures fell $1.65, or 1.53%, to $105.98 a barrel by 0758 GMT.
U.S. West Texas Intermediate crude fell $1.36, or 1.33%, to $101.12 a barrel.
Oil prices slipped on Friday but remained on track to end the week above $100 a barrel for the first time since mid-May as attacks along key Middle East shipping routes stoked prolonged supply disruption fears.
Both benchmarks rose more than 6% on Thursday and were still trading more than 10% higher on a weekly basis.
Supply disruptions lift diesel and other fuel prices
Global oil supply and demand will fall further than previously thought this year, the International Energy Agency said, as a lack of progress in ending the Iran war delays the return of normal Middle East flows into 2027.
Oil supply disruptions due to the Iran war, along with Ukrainian attacks on Russia's refineries, pushed the U.S. national average diesel price past $6 a gallon for the first time ever on Thursday, according to price tracker GasBuddy.
"Refined products, particularly diesel, are feeling a one-two punch right now," said Tim Waterer, chief market analyst at KCM Trade.
"As long as both the Gulf shipping constraints and Russian refining outages remain in play, diesel and other refined products are likely to show a higher upside tendency than the broader crude market," he added.
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