This is where you could find answers for the most common questions prospective in biodiesel field.

What is biodiesel?

  • Biodiesel is the name of a clean burning alternative fuel produced from domestic, renewable resources.
  • Biodiesel is simple to use, biodegradable, nontoxic, and essentially free of sulfur and aromatics.
  • Biodiesel contains no petroleum, but it can be blended at any level with petroleum diesel to create a
    biodiesel blend.

What is the difference between biodiesel and ethanol?

  • Biodiesel is essentially diesel fuel, used for truck, bus and other equipment in diesel designed engines.
  • Ethanol is used as an additive with gasoline up to 10% or used as E85 which is 85% ethanol and designed for use in ethanol or flex-fuel approved gasoline engines.

What does the number mean after the B ? Example: B2, B20?

  • The biodiesel numbers stands for the % of blend – a blend of ULSD (ultra-low sulfur diesel) and biodiesel.
  • A B2 blend is 2% biodiesel and 98% petro diesel (ULSD). A B20 blend is 20% biodiesel and 80% petro diesel (ULSD)

What is the most popular type of biodiesel?

  • At this time, it is B5 (5% biodiesel) as this blend is most commonly mandated for use by states for municipalities, including government vehicles. Many fleets have already stepped up use and are using B20 (20% biodiesel)

Is biodiesel used as a pure fuel or is it blended with petroleum diesel?

  • Biodiesel can be used as a pure fuel or blended with petroleum in any percentage.
  • B20 (a blend of 20 percent biodiesel with 80 percent petroleum diesel) has demonstrated significant environmental benefits with a minimum increase in cost for fleet operations and other consumers.

Is biodiesel better for human health than petroleum diesel?

  • Scientific research confirms that biodiesel exhaust has a less harmful impact on human health than petroleum diesel fuel. Pure biodiesel emissions have decreased levels of polycyclic aromatic hydrocarbons (PAH) and nitrited PAH compounds that have been identified as potential cancer causing compounds.
  • Also, particulate matter, an emission linked to asthma and other diseases, is reduced by about 47 percent, and carbon monoxide, a poisonous gas, is reduced by about 48 percent.

Can I use biodiesel in my existing diesel engine?

  • Biodiesel blends of up to 20 percent work in any diesel engine with no modifications to the engine or the fuel system. It can be used in compression ignition (diesel) engines with no major modifications.
  • Biodiesel has a cleansing effect that may release deposits accumulated on tank walls and pipes from previous diesel fuel usage.

Are biodiesel and vegetable oil the same thing?

  • No, biodiesel is produced through a chemical process called transesterification which converts oils and fats of natural origin into fatty acid methyl esters (FAME). Combustion of vegetable oil without conversion to biodiesel will lead to soot accumulation and deposits that may lead to power loss and engine failure.

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Do I need to do any modifications to my diesel vehicle to use biodiesel?

  • If your car was made prior to 1993, the rubber fuel lines will probably have to be replaced. One of the major advantages of using biodiesel is the fact that it can be used in existing diesel engines without negative impacts to operating performance. Biodiesel is the only alternative fuel for heavyweight vehicles that does not require any special injection or storage modifications.
  • It is important to note that newer diesel vehicle models of Volkswagen, BMW and Mercedes (2007 or later) have a fuel system that utilizes a Diesel Particulate Filter (DPF) that can create a fuel/oil dilution in the diesel engine, whether diesel or biodiesel fuel is used. Over time the engine oil could be diluted by the fuel if certain precautions are not taken. One recommendation is to ensure you are running your diesel engine regularly. And, if you use 100% biodiesel in these vehicles, you must change the oil at least every 3,000 miles and check your oil level regularly (this is not an issue with vehicles using biodiesel blends, such as B20)

Will using biodiesel void my warranty?

  • The Department of Energy explains in its Biodiesel Handling & Use Guide: “Federal law prohibits the voiding of a warranty just because biodiesel was used. The biodiesel would need to be shown as the cause of the failure. If an engine experiences a failure caused by biodiesel use (or any other external condition, such as bad diesel fuel), the damage will not necessarily be covered by the OEM’s warranty.”

Can I run biodiesel in my gasoline engine?

  • No, biodiesel can only run in conventional compression-ignition (diesel) engines!

Can I go back and forth between petroleum diesel and biodiesel?

  • Yes, you can use biodiesel and diesel fuel interchangeably, as well as blended.

Will I need to change my fuel filters more often when using biodiesel?

  • Biodiesel is a solvent. It will clear many diesel deposits that have accumulated in your fuel tank. This may cause initial fuel filter clogging but continued use of biodiesel will not cause an increased frequency of filter changes.

Is biodiesel good for my engine?

  • Yes, biodiesel can actually extend the life of your engine. Biodiesel has superior lubricating properties that reduce the wear of vital engine parts.

How do the emissions of biodiesel and petrodiesel differ?

  • Using biodiesel instead of petrodiesel will significantly reduce unburned hydrocarbons, carbon monoxide, and particulate matter from tail pipe emissions. It will also virtually eliminate sulfur oxides and sulfates which are major contributors to acid rain. Nitrogen oxide emissions may slightly increase, but can be remedied with newer low-emission diesel engines.

Does biodiesel contain diesel fuel?

  • Pure biodiesel, B100 (100% biodiesel) does not contain petrodiesel. Biodiesel can be blended with petrodiesel and is frequently sold as B20 (20% biodiesel, 80% petrodiesel blend) or B5 (5% biodiesel, 95% petrodiesel blend).