That primarily impacts Canadian heavy crude exports. The BP Whiting refinery was the primary consumer of Canadian crude.

Few other refineries (other than some on the Gulf coast) are configured to handle the product.

That's why Canadian crude prices are collapsing...and why the price of gasoline in the upper midwest is going up.

The only other option for Canadian crude to pipeline export to the Texas gulf coast. The problem is pipeline capacity (that's why some much Canadian oil goes out by train), but even more critically, the pipelines typically offload at the giant Cushing OK storage center...and Cushing is right at 100% storage capacity. (you can't just pump crude straight into a refinery...there a timing mis-match that has to be dealt with via storage).

The Canadians are about to really get squeezed.