The Brent/WTI spread has historically ranged between $4/bbl and $8/bbl, but it can expand or contract based on factors related to U.S. and international supply and demand conditions. For example, the Brent/WTI spread hit nearly $14/bbl in April 2011 when protests sparked market fears of significant oil supply disruptions in the Middle East.

U.S. crude oil rose nearly 3% on Monday, as the market waited for Israel to strike Iran. Oil prices spiked last week on fears that Israel could hit the Iran's oil industry in retaliation for Tehran's ballistic missile attack.

WASHINGTON — President Biden said Thursday that the US is “discussing” the possibility of Israel bombing Iranian oil facilities as payback for a volley of nearly 200 rockets fired at the Jewish state on Tuesday — causing a spike in global crude prices.