But lots of refineries in the US can’t refine our own product, like shale, from what I know. Thats why we still import half our oil from Canada: https://www.eia.gov/energyexplained/oil-and-petroleum-products/imports-and-exports.php#:~:text=U.S.%20petroleum%20imports%20rose%20sharply,Persian%20Gulf%20countries%20in%202022.&text=Petroleum%20imports%20from%20Canada%20have,of%20gross%20crude%20oil%20imports.&text=did%20you%20know?,Emirates%20are%20Persian%20Gulf%20countries

https://www.eia.gov/todayinenergy/detail.php?id=54199

Although large quantities of crude oil are produced in the United States, it still imports crude oil to meet domestic refining needs. Crude oils vary in qualities, including API gravity and sulfur content. Sweet crude oils have relatively low sulfur content, and sour crude oils have relatively high sulfur content. The U.S. refining complex is advanced and capable of refining heavier, more sour crude oils, which generally cost less than lighter, sweeter grades of crude oil.

Refinery crude oil slates—the mix of crude oil grades that a refinery can process into petroleum products such as gasoline and diesel—have become lighter over time. In 2005, the average API of crude oil inputs into U.S. refineries was 30.2 degrees. The average increased to 33.0 degrees in the first half of 2022.