Motor oil is essential to fossil fuel motors. Many humans do not think about getting grease or oil on their hands when working on motors, but they are putting themselves at risk. Used motor oil contains, benzene, hydrocarbons, gasoline, diesel, antifreeze, and metal shavings from the engine. Frequent exposure to motor oil and used motor oil can cause skin rashes, dermatitis, blood anemia, headaches, tremors, and skin cancer. There are currently no alternatives to using motor oil so humans need to protect themselves from frequent exposure. When working with oils wearing gloves is the only way to limit exposure. In conclusion, motor oil and in particular used motor oil is hazardous to both people and the environment.

Human exposure to benzene has been associated with a range of acute and long-term adverse health effects and diseases, including cancer, aplastic and anemia. Exposure can occur as a result of the ubiquitous use of benzene containing petroleum products, including motor fuels and solvents. Benzene is highly volatile, and exposure occurs mostly through inhalation.Public health actions are needed to reduce the exposure by the general population to benzene.

The Center for Disease Control and Prevention (CDC) recommendation: avoid exposure to motor oil and inhalation motor oil fumes.