What is the difference between WVO/SVO and biodiesel?

"What is the difference between WVO/SVO and biodiesel?

Biodiesel is created with a chemical reaction that uses 80% vegetable oil and 20% methanol. The product can be blended with diesel and poured directly into the tank of any diesel vehicle. Biodiesel will gel at higher temperatures than petroleum diesel and can cause damage when used in high concentrations to fuel systems that use natural rubber, rather than synthetic rubbers. Blended biodiesel will be denoted by it's percentage of biodiesel in the blend. B20 is a blend of 20% biodiesel and 80% petroleum diesel. 100% biodiesel usually costs much more than petroleum diesel.

WVO (Waste Vegetable Oil) and SVO (Straight Vegetable Oil - usually virgin oil) vehicle conversions allow diesel vehicles to run on vegetable oil that has not been chemically altered like biodiesel. The oil is thinned by heating it. The vehicle must be started and shut down on petroleum diesel or biodiesel. Once it reaches operating temperature it can be switched to run on the WVO or SVO."

http://www.smarterfuel.com/faq.html

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