When the White House imposed a 50 percent tariff on a range of Canadian products last week, it left out one of the country’s largest exports to the U.S.: crude oil.

The U.S. buys the vast majority of Canadian oil exports – 90 percent in 2025, according to Yahoo Finance. The U.S. also imports more crude oil from Canada than any other country, with Canadian crude account for 63 percent of all U.S. imports last year.

The U.S. is seeing oil stockpiles plummeting to their lowest in over four decades because of the Iran war, with gasoline prices about 30 percent higher than before the war. U.S. refineries are also geared to profitably process heavier grades of crude like those from Canada, while the U.S. exports much of its domestically produced “light, sweet” crude.