What companies deal with waste oil disposal?

In the United States, companies such as Waste Oil Recyclers, Safety-Kleen and Thermo Fluids recycle used oil. Each company deals in the recycling of oil and other chemicals.

Oil recycling companies often provide used oil pickup services, and each operates in a particular region or state. A reputable company provides assurance that it is responsible and complies with all regulations of the U.S. Environmental Protection Agency, or EPA, when it deals with disposing of used oil. Once the used oil has been recycled, it is returned to its original state, making it suitable for use once again.

To be a used oil, an oil must be synthetic and have been used and contaminated by machinery, as noted by the EPA.