Motor Oil Containers (Empty) Hazardous Waste Oily rags can also be disposed of as hazardous waste. In addition to the Household Hazardous Waste program, curbside collection of used motor oil is also available for residential homes, townhomes and mobile home parks. Find out how to arrange a used motor oil pickup. Empty But Still Hazardous Any leftover motor oil or residue is hazardous. Empty motor oil containers must be treated as Household Hazardous Waste (HHW). Do Not Store Other Chemicals in Empties Adding other chemicals into an empty motor oil bottle is dangerous. You can inadvertently create toxic byproducts when the chemicals mix with the motor oil residue. Did You Know? What Happens to Recycled Motor Oil Used motor oil can be cleaned and recycled, which helps keep it out of waterways. Recycled oil is then used to make heating oil, asphalt and other petroleum-based products; it is usually not recycled and resold as motor oil.