Item: Used motor oil and oil filters Jurisdiction: Seattle city limits / King County, Washington Last updated: July 2026
Quick Answer
Take used motor oil to the North Seattle HHW Facility (12550 Stone Ave N, Sun–Tue 9–5) free for King County residents, or to any King County HHW collection site (Factoria, Auburn, etc.). Many auto parts stores also accept used oil free of charge — but you must call the specific Seattle store first to confirm.
Do not mix used oil with other fluids (antifreeze, brake fluid, solvents, gasoline, or water). Contaminated oil cannot be recycled. Store oil in clean, sealed containers — original oil jugs work well. Transport upright in a leak-proof bin.
Oil filters: Hot-drain them for 12+ hours before disposal. King County HHW sites accept used oil filters for recycling. Whether drained filters can go in regular Seattle trash is not confirmed — verify with Seattle Public Utilities.
Quick Facts
- Primary drop-off: North Seattle HHW Facility — 12550 Stone Ave N, Sun–Tue 9–5 (free, no appointment)
- Auto parts stores: O'Reilly, Advance Auto, and others may accept used oil — call the specific store
- King County sites: Factoria (Tue–Sun), Auburn, and Wastemobile — free for King County residents
- Not accepted at: Seattle Transfer Stations (North or South) — they do not take HHW
- Not collected curbside: No HHW curbside pickup in Seattle
- Container rule: Clean, sealed containers with tight lids — max size per container not confirmed
- Per-visit quantity limits: Not confirmed — verify with the facility
- Business oil: Not eligible for free HHW programs
- Hours discrepancy: North facility shows 9–5 on seattle.gov, 9:30–4:30 on Recology — call ahead
Can Seattle Pick Up Used Oil Curbside?
No. Seattle does not offer curbside household hazardous waste collection. Motor oil is classified as hazardous waste and cannot go in your regular garbage cart, recycling bin, or down any drain.
Seattle's Transfer Stations (North and South) also do not accept HHW including motor oil. Do not take used oil to the transfer station tipping floor.
The only legal drop-off routes for residents are the dedicated HHW facilities, King County HHW sites, and eligible auto parts stores.
Seattle HHW Facilities for Motor Oil
North Seattle HHW Facility
- Address: 12550 Stone Ave N
- Hours: Sunday–Tuesday, 9:00 AM – 5:00 PM (per seattle.gov)
- Hours note: A Recology partner site lists Sun–Mon–Tue 9:30 AM – 4:30 PM. Call ahead to confirm.
- Appointment: Not required
- Cost: Free for King County residents
- Accepts: Used motor oil and oil filters (for recycling)
South Seattle HHW Facility
A South facility exists but its address and hours are not confirmed in the available official sources. If the South location is closer, check the Seattle Public Utilities HHW page or call to ask for current details.
King County HHW Sites for Motor Oil
Seattle residents (who are also King County residents) have additional free drop-off options:
| Site | Hours | Notes |
|---|---|---|
| Factoria Recycling & Transfer Station | Tuesday–Sunday | HHW drop-off on site |
| Auburn | Varies | Check King County HHW site list |
| North Seattle location | Unconfirmed | Verify via King County |
| Wastemobile (seasonal) | Varies | Mobile service at different locations |
All King County HHW sites accept used motor oil and oil filters free for county residents. Hours vary by location — check the King County HHW website before visiting.
Auto Parts Store Used Oil Acceptance
Auto parts stores are a convenient alternative because they typically have longer hours than HHW facilities. However, participation varies by store and can change without notice.
Stores that typically accept used motor oil:
- O'Reilly Auto Parts
- Advance Auto Parts
- AutoZone (policies vary)
Before taking oil to any auto parts store:
- Call the specific Seattle location — do not rely on national corporate policy
- Ask: Do you accept used motor oil from individuals?
- What is the quantity limit per visit?
- Do you accept oil filters as well?
- Is there any fee?
Important: Store policies change without notice. A store that accepted oil last month may have suspended the program. Always call first.
Oil Filter Disposal Rules
Used oil filters contain residual oil and are handled differently than the oil itself.
What the sources confirm:
- King County HHW sites accept used oil filters for recycling
- Filters should be hot-drained for 12+ hours before disposal
What is NOT confirmed:
- Whether hot-drained oil filters can go in regular Seattle trash is not documented in the available official sources
- Ask Seattle Public Utilities or the HHW facility when you drop off your oil
Your safest bet: take drained filters to the same HHW facility or King County site where you drop off your used oil. Place drained filters in a sealed plastic bag before transport.
What NOT to Mix With Used Oil
This is the most important rule: Do not mix used motor oil with any other fluid.
| Do NOT mix with | Reason |
|---|---|
| Antifreeze / coolant | Contaminated oil is rejected and may become hazardous waste |
| Brake fluid | Cannot be recycled |
| Solvents or thinners | Creates a hazardous mixture |
| Gasoline / diesel | Fire risk, cannot be recycled |
| Water | Causes separation and contamination |
Mixing any of these fluids with your used oil means the entire container may be rejected at drop-off and will be treated as contaminated hazardous waste instead of recyclable oil.
Use separate containers for each fluid type. Label each container clearly.
Business and Commercial Oil Disposal
The free HHW programs (Seattle, King County, auto parts stores) are for household-generated waste only.
- DIY oil changes at home: Eligible for free drop-off
- Shop or commercial vehicle oil: Not eligible — must use a licensed used oil transporter
- Contractor oil waste: Not eligible — contact commercial disposal services
- Apartment maintenance oil: If from a business operation, not eligible for residential HHW
Businesses generating used oil in Washington state need a licensed used oil transporter to handle pickup and disposal. Search for "Seattle used oil recycling" for commercial providers.
Apartment and Multi-Unit Oil Disposal
Apartment resident with DIY oil change: You are eligible to use Seattle and King County HHW facilities as an individual King County resident. Your building's waste service does not affect your eligibility. Bring proof of residency.
Multi-unit building with oil storage tank: Some apartment buildings in Seattle have a used oil storage tank for residents to use. Ask your property manager or maintenance staff before hauling oil to a facility yourself. If no tank exists, your options are the same as any other resident.
Renter with no vehicle: Used oil is heavy and spills easily. Do not transport on public transit. Ask a neighbor with a car or use a rideshare. Secure the container upright in a leak-proof bin in the trunk.
How to Prepare Used Oil for Transport
- Store in clean, sealed containers — original 5-quart oil jugs work perfectly
- Label the container clearly: "Used Motor Oil — for recycling"
- Do NOT mix with any other fluids
- Transport upright in a leak-proof plastic bin or cardboard box in your vehicle trunk or truck bed
- Hot-drain oil filters for 12+ hours, then place in a sealed plastic bag
- Verify max container size and per-visit limits with your chosen drop-off location
- Bring proof of King County residency — WA driver's license or utility bill
- Clean up any spills immediately with cat litter or absorbent — do not wash down drains
Costs and Fees
- North Seattle HHW Facility: Free for King County residents
- King County HHW sites: Free for King County residents
- Auto parts stores: Typically free, but verify per store
- Special Item Collection: Motor oil is not eligible for this program
- Business/commercial oil: Paid service via licensed transporter
Route Comparison
| Option | Cost | Pros | Cons | Verify |
|---|---|---|---|---|
| North Seattle HHW Facility | Free | Dedicated HHW staff, accepts filters too | Limited hours Sun–Tue, hours discrepancy | Check seattle.gov or call |
| King County HHW Sites (Factoria, Auburn) | Free | More days (Factoria Tue–Sun), multiple locations | May be farther from Seattle | Check kingcounty.gov |
| Auto Parts Store (O'Reilly, Advance) | Free (typically) | Extended hours, many locations | Per-store policy varies, may reject filters | Call the specific store |
| Licensed Used Oil Transporter | Paid | Legal for businesses and bulk | Requires scheduling, expensive for households | Search for Seattle used oil companies |
Mistakes to Avoid
1. Pouring oil down the drain or on the ground
Used motor oil is toxic. Pouring it down drains, into storm sewers, or onto the ground is illegal in Washington and harms the environment. One quart of oil can contaminate 250,000 gallons of water.
2. Mixing oil with other fluids
Contaminated oil cannot be recycled and may be rejected at drop-off. Keep each fluid type separate.
3. Assuming auto parts stores always accept oil
Store participation changes without notice. Always call the specific Seattle location before bringing oil there.
4. Taking oil to a transfer station
Seattle Transfer Stations do not accept HHW. You will be turned away.
5. Disposing of oil filters incorrectly
Do not throw undrained oil filters in the trash. Hot-drain for 12+ hours. King County HHW sites accept filters for recycling — verify whether drained filters can go in regular trash.
6. Transporting oil in the passenger cabin
A spill inside your vehicle is hazardous and expensive to clean. Always transport in the trunk or truck bed in a leak-proof container.
7. Not wearing gloves
Used motor oil is carcinogenic. Avoid skin contact by wearing disposable gloves during handling.
Frequently Asked Questions
Can I pour used motor oil down the drain or in the garbage? No. Used motor oil is hazardous waste. Pouring it down drains, storm sewers, or into regular garbage is illegal and harms the environment.
Is the North HHW facility free for motor oil disposal? Yes. Free for all King County residents, no appointment needed.
Can I take used oil to an auto parts store? Many auto parts stores in Seattle accept used oil free of charge, but each store sets its own policy. Call the specific store first.
What should I do with used oil filters? Hot-drain the filter for 12+ hours. King County HHW sites accept filters for recycling. Whether drained filters can go in regular trash is unconfirmed — verify with SPU.
Can I mix used oil with antifreeze or other fluids? No. Mixed fluids cannot be recycled and may be rejected. Store and transport each fluid type separately.
How much used oil can I bring per visit? Quantity limits per visit are not confirmed in available sources. Call the HHW facility or auto parts store to ask before bringing large volumes.
Official Verification Checklist
Use this when contacting the drop-off location or checking official pages.
- Confirm HHW facility or auto parts store hours — verify open today and current hours
- Confirm quantity limits per visit — how many gallons of oil accepted per trip?
- Confirm oil filter acceptance — does the drop-off location accept used oil filters?
- Confirm container requirements — what containers are accepted? Max container size?
- Check mixed-fluid policy — will they accept oil that might be contaminated?
- Confirm proof of residency needed — driver's license or utility bill with Seattle address
- Ask about South facility (if closer) — South HHW facility address and hours not confirmed
- Verify non-mixing rule — separate containers for each fluid type
Sources
- Seattle Public Utilities — Collection & Disposal Hub
- Hazardous Waste Items — Seattle Public Utilities
- Where to Dispose of Hazardous Waste — Seattle Public Utilities
- North Transfer Station & HHW Facility — Seattle Public Utilities
- Hazardous Waste Management Program — King County
- Accepted Hazardous Products — King County
This guide is based on official sources available as of July 2026. Facility policies, fees, hours, and eligibility rules change. Always verify current information with Seattle Public Utilities, the King County HHW program, or the specific auto parts store before hauling used motor oil.