1) Petroleum product 
Petrox was a detergent additive used from 1954 to 1989 by Texaco, in its premium-grade `Sky Chief` gasoline. A new plant in Port Arthur, Texas was built to manufacture Petrox. Petrox continued to be used in Texaco`s highest-octane gasoline for more than 30 years even after its leaded `Sky Chief` grade was replaced in 1981 by `Super Lead-free...