Used Motor Oil & Filters Hazardous Waste See Alternatives Illegal in Garbage & Drains Residential curbside disposal of used motor oil and oil filters is offered throughout San Luis Obispo County. Contact your hauler for a FREE container and FREE curbside pick-up. Find out what to do with household hazardous waste Don't Dump in Trash or Down Drain Used motor oil is a major contaminant of waterways, so never dump down the drain or in the trash. Filters also leak toxic materials into waterways, which are slow to break down in the environment. Never Mix with Other Chemicals Service stations will not accept motor oil that has been contaminated with other products like antifreeze. Don’t mix your motor oil with anything else. Alternative Ways to Recycle Take to Service Stations Certified oil recycling centers are located throughout San Luis Obispo County. Find one that’s certified. Dispose of at a Household Hazardous Waste Facility Motor oil and filters can also be disposed of at a Household Hazardous Waste Facility. 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.