The Nation’s Largest Refiner

Marathon Petroleum employee turning a valve

Safe, Efficient and Reliable - Coast to Coast

With a crude oil refining capacity of more than 3 million barrels per calendar day in our 16-refinery system, Marathon Petroleum plays a significant role providing refined products that you use every day.

Our refineries are integrated with each other via pipelines, terminals and barges to maximize operating efficiency. The transportation links that connect our refineries allow the movement of intermediate products between refineries to optimize operations, produce higher margin products and efficiently utilize our processing capacity.