I thought Valero specialized in refining “sour” (Venezulan) crude.
Valero has some refining capabilities to handle heavy crude, but they are more than that.
http://www.valero.com/OurBusiness/pages/Home.aspx
Valero supplies fuel and products that improve people’s lives with 16 refineries and 10 ethanol plants stretching from the U.S. West and Gulf coasts to Canada, United Kingdom and the Caribbean.
I know they have been expanding capabilities to take in oil from the Eagle Ford and Permian Basin shale expansions in Texas.