Knox Oil of Texas manufactures and distributes a line of diesel fuel and fuel products under the label Super Diesel. The company s additives are sold and used throughout North and South America, and the company owns several truck stops throughout Texas. Knox Oil of Texas traces its history as far back as 1860, when A.L. Knox became one of the first people to acquire oil fields in Pennsylvania. The company maintains its corporate headquarters in Dallas, Texas and has been in business for more than 140 years.