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Frequently Asked Questions

Do you have any questions regarding our used cooking oil and grease trap services or our commitment to sustainability? Find answers to frequently asked questions below. As a reminder, SeQuential has merged with Mahoney and now has their brand name. We still have the same great services — just a new and improved name and servicing abilities!

Used Cooking Oil Collection

How do I sign up?

Signing up is simple and convenient! Fill out our form or give us a call for an Account Manager get you set up with a complementary used oil bin and regular pick-up schedule.

Is there a fee for the service?

There is NO COST for used cooking oil recycling service!

How does used cooking oil recycling work?

After an Account Representative meets with you to assess your needs, we will provide you with a clean, durable storage container to store used cooking oil, and arrange a collection schedule for you. After each collection, we will record the amount of useable oil, which is usually the majority of the total volume collected. Any rebates will be issued based on that amount depending on your volume.

What do you do with the oil you collect?

The oil we collect is turned into renewable fuel at one of our state-of-the-art production facilities. The resulting fuel is then distributed throughout the region to provide sustainable fuel for vehicles, aircrafts, and more.

Where is my used cooking oil taken after it is collected?

The oil we collect is taken in long-haul trucks to our processing plants in Salem, OR, and Martinez, CA.

Can I get my oil picked up more frequently?

Frequencies are set based on your historical oil production and the size of your container. We understand that cooking oil production can increase based on a variety of factors. If you find your container is filling up more frequently than usual, let us know and we’ll adjust the schedule.

My container is full and I need to change my fryer. What should I do?

Call or email customer service for a pickup and store additional oil in buckets or cubes that the cooking oil originally comes in, next to our container. Make sure to notify customer service of the additional oil so we can notify the driver.

Can you also pump out my grease trap?

Yes! We offer grease trap cleaning service in many areas. This is a separate separate service, and pricing can vary. Please contact customer service for additional information.

I saw a Mahoney truck picking up my oil. Is that okay?

Yes! SeQuential merged with Mahoney on 01/01/2o24, and you will now see both brands working together.

Grease Trap Cleaning

How do I get a quote?

Please fill out the sign up form or call 1 (800) 447-3794 to speak with one of our Account Managers.

How much does it cost?

Pricing for grease trap service varies on the size, location and condition of your trap. Please contact us or call 1 (800) 447-3794 to arrange a consultation with one of our Account Managers.

How frequently should I clean my trap?

Cleaning frequency will vary depending on the size of your trap and the amount of grease used in your kitchen. Most cities require traps be cleaned frequently enough to maintain less than a specified level of FOG (fats, oils and greases) accumulation. This usually results in cleaning at least once per quarter, and sometimes more frequently. Our Account Managers can help you determine an appropriate cleaning frequency.

What happens to the FOG you clean out of my trap?

99% of the grease trap material we pump is taken to anaerobic digesters, where it is turned into clean energy for heating and power. The remainder is processed at our licensed facilities and treated according to local environmental regulations. No grease trap material is ever put down the drain.

My trap is overflowing. Can you help?

Overflowing grease traps can either be the result of going too long between cleanings, or a problem with your pipes. In either scenario, we recommend you consult with a plumber to ensure the issue is addressed swiftly and completely.

Can you also take my used cooking oil?

Yes! We offer FREE used cooking oil recycling service. Please contact customer service to get started.

How can I pay for my grease trap service?

We offer a variety of options to pay for your service.

  • Online: Visit our Make a Payment page to easily and securely submit your payment
  • Auto-pay: Call our Accounting Team to set up your account on auto-pay with a credit card (971)-357-1498
  • Check: Mail your payment via check to SeQuential Environmental Services, LLC P.O. Box 102436 Pasadena, CA 91189-2436
Where do I mail checks to pay for grease trap services?

Please mail all checks to SeQuential Environmental Services LLC, P.O. Box 102436 Pasadena, CA 91189-2436. We cannot accept checks mailed to any other address.

A Mahoney Service Technican was servicing my grease trap. Is that okay?

Yes! SeQuential merged with Mahoney on 01/01/2o24, and you will now see both brands working together.


What is renewable fuel?

Neste MY Renewable Diesel™ (R99 diesel) is a sustainable, Hydrotreated Vegetable Oil (HVO) that is chemically identical to fossil diesel. It’s a drop-in replacement that performs like fossil diesel and can be used without any modifications, neat or blended at any ratio.

How is renewable fuel better for the environment?

Renewable diesel fuel has several advantages over fossil diesel. Compared to fossil diesel, renewable
diesel can reduce greenhouse gas emissions by up to 75% gas emissions (CO2 equivalent) over its life cycle.

How is renewable fuel different from biodiesel?

Renewable diesel, or HVO (Hydrotreated Vegetable Oil), is sometimes confused with biodiesel or FAME (Fatty Acid Methyl Ester). The main differences between the two are found in their chemical compositions, performances in cold weather and storage qualities. Biodiesel contains oxygen, making it different from both fossil diesel and renewable diesel and renewable diesel and therefore it cannot act as a 100% substitute. Nearly all OEMs limit biodiesel content to 20% with some only allowing 5%

What does Neste do?

Neste is in the business of fighting climate change! They are committed to helping North American businesses and cities reduce their carbon footprint through renewable solutions. Mahoney (formerly SeQuential) plays a role in this mission by collecting and supplying used cooking oil that is transformed into renewable fuels. Learn more about Neste here.

How is Mahoney (formerly SeQuential) related to Neste?

Mahoney (formerly SeQuential) is a subsidiary of Neste as of January 2023.

Any other questions?

Our dedicated Customer Service team is at your service, available Monday to Friday, from 7:00 AM to 5:00 PM, to address any inquiries you may have. We are eager to provide assistance and support with our expertise in used cooking oil collection and grease trap maintenance services. Count on us to deliver exceptional customer service and reliable solutions. We are excited to have the opportunity to serve you and look forward to assisting you every step of the way.

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