Used Motor Oil & Filters See Alternatives Illegal in Garbage & Drains Hazardous Waste 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. 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 The best way to recycle used motor oil and filters is to take them to a service station or auto shop. Find one that’s certified. 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.