Universal Lubricants and Enterprise Holdings have formed a business alliance that closes the car loop, promising to conserve finite natural resources and help protect the environment.

Beginning at Enterprise's airport service centers in five different states, Universal Lubricants will collect the spent motor oil of Alamo, Enterprise and National vehicles and proceed to re-refine the waste fluid, according to a press release. This process transforms the once unwanted discharge into an American Petroleum Institute (API) certified ECO ULTRA high performance motor oil.

The green motor oil will then circle back into Enterprise cars and light trucks, completing a self-sustaining cycle that will continuously repeat itself.

“We are always looking for innovative ways to better manage our business sustainably, and this program represents a great example,” said Lee Broughton, director of sustainability for Enterprise Holdings.

John Wesley, CEO of Universal Lubricants said, “Too often business ventures are seen as diametrically opposed to environmental interests. The collaboration between Universal Lubricants and Enterprise Rent-A-Car contests that very assumption, providing a shining example of the innovation and possibility that arises when a commitment to customer service fuses with formidable environmental stewardship.”