Oil ended the week sharply higher after the United States and Iran resumed military exchanges, marking another escalation in a conflict that has already disrupted energy flows across the Gulf. Reuters reported that crude recorded its strongest weekly gain since mid-July as traders assessed the possibility of further supply interruptions.
The pressure is particularly acute in refined products. US diesel prices reached a record $5.820 per gallon on Thursday, according to GasBuddy data cited by Reuters. Diesel prices have risen 55% since the US-Israeli war on Iran began on February 28.
The market's vulnerability stems partly from the importance of Gulf exports. Before the conflict, approximately 900,000 barrels per day of diesel and 350,000 barrels per day of jet fuel moved through the Gulf, representing significant shares of global seaborne supplies, according to cargo-tracking data cited by Reuters.
Diesel carries particular economic importance because it sits at the centre of commercial transportation, agriculture, construction and industrial activity. Sustained price increases can therefore spread beyond petrol stations into freight rates, food costs and business operating expenses.
The latest escalation also raises questions over the effectiveness of efforts to contain the disruption. On Saturday, US Central Command said US forces had struck three Iranian oil tankers, including one near Kharg Island.
For energy markets, this increases the premium attached to physical security. Traders are no longer pricing only the possibility of production losses; they are assessing risks to shipping, refining and distribution infrastructure.
The consequence is a potentially broader inflation shock. If elevated diesel costs persist, central banks may face higher input prices at precisely the moment financial conditions are already tightening.
The conflict has therefore moved beyond the conventional oil-price channel. It is becoming a test of the resilience of the global refined-fuel system — with consequences extending from transport operators to consumers and monetary policymakers.
