Why used oil needs special handling
Used motor oil is not just dirty oil. As it works inside the engine it picks up metal particles, fuel, and other contaminants. A single oil change can hold enough oil to pollute a large amount of water if it reaches the environment.
That is why pouring oil down a sink, storm drain, or onto the ground is both harmful and, in most places, against the law. It can contaminate groundwater and harm wildlife. The good news is that used oil can be cleaned and re-refined, so recycling it keeps a useful resource in circulation instead of in the soil.
How to collect and store it
When you drain your oil, catch it in a clean drain pan and pour it into a sturdy, sealable container. A jug that once held fresh oil works well. Avoid containers that held chemicals like bleach or antifreeze, since any leftover residue can contaminate the batch.
Seal the container tightly and label it so no one mistakes it for something else. Keep it away from heat and out of reach of children and pets until you can drop it off. Drain the old filter into the same pan, let it sit to release trapped oil, then bag it for recycling.
Where to take it
Many auto-parts stores accept used oil and filters at no charge, and so do most municipal household-waste or recycling centers. Some quick-lube shops will take it as well. A quick call ahead confirms they accept what you have and saves a wasted trip.
If you ever spill oil, clean it up promptly with absorbent material rather than hosing it away. Disposing of used oil correctly takes only a few extra minutes, costs little or nothing, and protects local water and soil for everyone.