Mineral Oil - also known as 'Baby Oil'.
It's made from petroleum, it's the cheap run-off of making gasoline, and it's flammable. If aspirated (breathed in), it can cause chemical pnuemonia and even result in death.

When looking for an oil, consider this: Would you cook or bake with the oil? Is it something that we would feed our children because it's good and nutritious?

Also, the molecules of mineral oil are too large to be absorbed into the skin; hence, when rubbed on our body, it forms a clear synthetic coating over the largest breathing organ of the human body: Skin.