Frequently Asked Questions
PDF Print E-mail
  1. Can I use biodiesel in my car now?
    If you have a diesel car, yes, you can switch to biodiesel immediately. You can use B20 all the time or opt to use an even higher blend in the summer. You can not use biodiesel in a gasoline car, sorry. Biodiesel replaces diesel only.

  2. Can I use biodiesel in place of my regular home heating oil now?
    Yes!  Just call your oil supplier and ask for it.  Most of them will provide you with B5.  Look at our “Biodiesel in the Area” page for dealers we know are supplying it now.  Your dealer will tell you what to look out for, e.g. at first you may have to change your filter sooner than you are accustomed to since biodiesel cleans the machinery’s parts.

  3. Once I switch to biodiesel can I switch back to regular?
    Yes, biodiesel and diesel are pretty much interchangeable for both diesel vehicles and oil furnaces.

  4. Isn’t biodiesel using up food supplies, like corn, and increasing costs of food?
    No.  Biodiesel is not made from corn and can be made from recycled vegetable oils--after the oil has been used for its food value.  You are confusing biodiesel with ethanol, an alternate fuel that is used instead of gasoline.  Biodiesel, produces about 3.5 times as much energy as it takes to make it.

  5. Is Biodiesel classified as a hazardous material?

  6. Does biodiesel burn clearner?
    Yes. It contains no sulfur, far less dangerous particulates, and is nearly carbon neutral. Burning it does create NOx (see next question).

  7. How much NOx?
    Studies vary. Some laboratory research indicates slight increases in NOx by running biodiesel. Others find NOx neutral. Some claim that in "real-world driving conditions," NOx is decreased. Read more about our take on the NOx issue.

  8. Will I get the same power and fuel economy running biodiesel?
    Yes. Biodiesel contains 5% fewer BTUs per gallon than petroleum diesel, which is unnoticeable in onroad use.

  9. Is cold weather a problem in high percentage blends?
    Yes. The B99.9 in our tanks will begin to gel around freezing (between 32-36° F) and will clog fuel filters between 22-28° F. Gelled fuel melts when warmed. Fuel rarely gels while the engine running and circulating fuel through the system. Cold morning startups are generally the only time that gelling becomes an issue. To ensure cold weather operability we recommend taking precautions whenever temperatures are near freezing.
    There are three important actions you can take to continue using biodiesel in temperatures below freezing: add heat, add petroleum, or add a winterizing additive. The easiest cold weather solutions for central NC seems to be a B80 blend (80% biodiesel/20% petro-diesel) or, if you’d rather not add petro, you could use a cold flow additive.

  10. Does using biodiesel void my warranty?
    No. Read your actual warranty (not the propaganda the manufacturer or local dealer puts out). Engine manufacturers do not warranty the use of urine as a fuel in their engines any more than they do petro-diesel or biodiesel. The point here is that if you put bad petro-diesel in your vehicle and it blows the engine up no manufacturer’s warranty will cover the repair. Manufacturer’s warranties cover parts and workmanship regardless of the type of fuel you choose to use. This is why using only high quality fuel that conforms to ASTM International quality standards (D975 for petro-diesel and D6751 for biodiesel) is important. The Magnusson-Moss Act (Title 15, Chapter 50 of the US Code) is the letter of the law.

  11. How long can biodiesel be stored.
    A. Depends how you are storing it. Keep it dark. Keep it at constant temperature. Keep the water out of it. Give it a year.

  12. If biodiesel were spilled, would it damage the environment?
    Possibly.  Biodiesel is non-toxic and biodegradable, but anything in concentration can damage the environment.  Don’t spill it. Keep it stored properly, and handle it properly, and keep it out of "the environment."

  13. Does it combust like gasoline?
    No. According to the Fire Prevention Code (Chapter 34, Section 3402) it is a Class IIIB combustible liquid, not a flammable.

  14. Does it combust like natural gas or propane?
    No. Visit your local grassroots hydrogen coop for more information on how these things combust.

  15. Can I run my car on vegetable oil? Yes, but you’ll need to convert your car.


For more information visit White Mountain Biodiesel's web site.  White Mountain Biodiesel is New Hampshire's largest biodiesel producer.