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Biodiesel can be made from any{{fact}} fat or oil. It can be used in nearly any diesel engine, with little or no engine conversion. However, biodiesel is a stronger solvent than regular diesel ({{WP|petrodiesel}}) - so much so that it will not only "clean out" the fuel tank, sending debris into the fuel filter, but it will also soften and dissolve many rubber and plastic products, including those used in fuel lines, filters and pumps. This deterioration can take years, however, and the replacement of rubber components does not have to happen immediately. Thus for long life, a different grade of components is needed in an engine designed for biodiesel.  
 
Biodiesel can be made from any{{fact}} fat or oil. It can be used in nearly any diesel engine, with little or no engine conversion. However, biodiesel is a stronger solvent than regular diesel ({{WP|petrodiesel}}) - so much so that it will not only "clean out" the fuel tank, sending debris into the fuel filter, but it will also soften and dissolve many rubber and plastic products, including those used in fuel lines, filters and pumps. This deterioration can take years, however, and the replacement of rubber components does not have to happen immediately. Thus for long life, a different grade of components is needed in an engine designed for biodiesel.  
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Biodiesel produces less particulates than petrodiesel and is thus much better for the health of the population, particularly those living in urban areas exposed to significant levels of pollution.{{fact}}  
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Biodiesel produces less particulates than petrodiesel and is thus much better for the health of the population, particularly those living in urban areas exposed to significant levels of diesel pollution.{{fact}}  
    
==Vegetable oil extraction and conversion==
 
==Vegetable oil extraction and conversion==
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==Straight vegetable oil==
 
==Straight vegetable oil==
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While {{WP|straight vegetable oil}} can be used as fuel, it has a negative effect on the engine after prolonged use. Thus it is usually better to process the oil into biodiesel, especially for engines which get heavy use.
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While {{WP|straight vegetable oil}} can be used as fuel (new, or waste frying oil), it has a negative effect on the engine after prolonged use.{{fact}} Thus it is usually better to process the oil into biodiesel, especially for engines which get heavy use.
    
==Sources==
 
==Sources==
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*Search for literature discussing the health impacts of vehicle pollution, and different aspects of the pollution such as particulates vs other pollutants.{{sp}})
 
*Search for literature discussing the health impacts of vehicle pollution, and different aspects of the pollution such as particulates vs other pollutants.{{sp}})
 
*Design a relatively simple, reliable way of converting vegetable oil (waste and/or new) into biodiesel, to minimize the technical expertise and resources needed, perhaps making it more practical for production in small or medium-sized remote towns.{{sp}}
 
*Design a relatively simple, reliable way of converting vegetable oil (waste and/or new) into biodiesel, to minimize the technical expertise and resources needed, perhaps making it more practical for production in small or medium-sized remote towns.{{sp}}
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*It is claimed by a guest on an episode of the UK TV show ''Top Gear''[http://www.youtube.com/watch?v=GOFbsaNeZps] that adding a solvent makes straight vegetable oil runnier (less viscous) and better for use as fuel. The solvent used in the program is non-kerosene-based white spirit (non-kerosene based for tax purposes) added at 3% by volume to filtered used cooking oil. Does this work? Does it reduce the problems of straight vegetable oil, in terms of the long term effect on the car's engine and cold weather operation?{{sp}}
    
==See also==
 
==See also==

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