What is Stewart Lubricants & Service? On its surface, it is simply a business that works with mining businesses. After all, their primary field of work is to design, fabricate, install and maintain automatic lubrication systems, such as the ones used in heavy mining equipment. In addition to making automated lubrication systems, SLS also supplies the world class mining grade lubricants that these machines run on. In fact, SLS was incorporated in 1988 with the express mission of providing “service, lubrication, equipment, and lubricants to the mining industry” of Black Warrior Basin, Alabama and other industrial customers in the South-East. Their business has grown since then, adding a location known as SLS West in Gillette, Wyoming.