All ferous steel is quenched or treated with petrolem products from the foundry(rust inhibitor). If you had ever dealt with a 30 ton roll of sheet steel you'd know they are just about dripping with rust inhibitors. They all have had some sort of oil on them during the production process. Oil in a barrel is no worse or better than having a chemical liner burned out of them and maybe better after all its a natural product of decomposing plant material. Whats in those liners, plastics and chemicals. There are a few chemical products introduced into motor oils for lubrication that can either be washed out or burned off. Do some research into motor oil lubrication chemicals and you'll see whats exactly in the products... Then make a lucide and informed decision...Good luck.
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Some people spend an entire lifetime wondering if they made a difference in the world. But, the Marines don't have that problem.
Ronald Reagan, President of the United States; 1985