Waste services firm Heritage-Crystal Clean Inc. has bought RS Used Oil Services Inc. for an undisclosed amount.

Elgin, Ill.-based Heritage-Crystal Clean said in a news release that the acquisition of the Monee, Ill.-based used oil firm will add about 8 million gallons per year of used oil collection volume.

The purchase by subsidiary Heritage-Crystal Clean LLC of certain assets includes service routes covering Indiana, Ohio, Wisconsin and parts of Illinois. The added used oil product will be a key source of supply for the company's used oil re-refinery in Indianapolis.

The company expects to add about 3,800 new customers with the deal.

RS Used Oil Services is a subsidiary of Wichita, Kan.-based Universal Lubricants LLC. Universal Lubricants and RS Used Oil Services will continue to operate its used oil collection business in all areas in the midwestern and southern United States not covered by the agreement, including portions of Illinois served from its facility in Roxana, Ill. Universal Lubricants also will continue to sell finished lubricants and related products to customers throughout the United States.

“We expect this acquisition will allow us to improve the overall efficiency of our used oil collection fleet and move us closer to our long-term goal of collecting enough used oil to supply 100 percent of the feedstock required by our re-refinery," said Joseph Chalhoub, founder, president, and CEO of Heritage-Crystal Clean.

Heritage-Crystal Clean is a leading provider of parts cleaning, used oil re-refining, and hazardous and non-hazardous waste services primarily focused on small and mid-sized customers.