Welcome to McWherter Petroleum Services! McWherter Petroleum Services has been proudly serving Delaware, Ohio since 1961. We are a full-service petroleum and lubricant company which means that we cover everything from the tank to the comfort of the living room. Our goal is to provide our residential, commercial, and agricultural customers with all the petroleum, lubricants, and heating needs. At McWherter Petroleum Services, we are nationally certified oil and heat technicians. Our associates are friendly, reliable, and willing to go above and beyond to ensure your family is comfortable. We also service fuel oil furnaces and boilers. Call or stop by McWherter Petroleum Services!