Marathon Petroleum Company is on the Cruelty Free Investing animals use list for testing their chemicals on animals.
For example, this safety report cites toxicity levels based on animal tests:
MIDDLE DISTILLATES, PETROLEUM: Long-term repeated (lifetime) skin exposure to similar materials has been reported to result in an increase in skin tumors in laboratory rodents. (page 7)
Marathon Petroleum Corporation is an American petroleum refining, marketing, and transportation company headquartered in Findlay, Ohio. It was elected the best employer of United States in 2016 by Forbes. The company was a wholly owned subsidiary of Marathon Oil until a corporate spin-off in 2011.