Subsidiaries of HollyFrontier Corporation own and operate five complex refineries with an annual average crude oil capacity of approximately 554,000 barrels per day. Our refineries can process heavier, less expensive types of crude oil and still produce a high percentage of gasoline, diesel fuel and other high value refined products. Additionally, subsidiaries of HollyFrontier Corporation produce base oils and other specialized lubricants in the U.S., Canada and the Netherlands.