Can You Recycle Used Motor Oil? Used motor oil can be ‘re-refined’ and used again. Used motor oil can and should be recycled. It poses significant health and environmental risks if discarded improperly, and it offers a more efficient, less carbon-intensive alternative to making new motor oil from scratch. What Is Motor Oil? Motor oil is any oil used as an engine lubricant. It typically includes gasoline- and diesel-engine crankcase oils, as well as piston-engine oils for cars, trucks, boats, airplanes, locomotives, and heavy equipment, according to the U.S. Environmental Protection Agency (EPA). Motor oils may be petroleum-based or synthetic, although synthetic oils are still primarily made from fossil fuel sources. Motor oil itself is highly durable, but its dirty job still takes a toll. During normal use inside your engine, motor oil accumulates impurities ranging from dust and dirt to metal scrapings and various chemicals, eventually impeding its lubrication. On top of its own toxic