SEO + - Big Oak Oil Pa For over 90 years, Keystone Oil has been here for the community as a home heating oil company in Harrisburg PA area. Keystone Oil's first priority has been the complete comfort of you and your family. This committment has kept our doors open and our personnel ready to respond to your needs seven days a week, 365 days a year. In addition to our 24 hour emergency service, Keystone Oil offers the hi Mon, 11 Feb 2019 21:11:07 UTC en