How do I make bio diesel from used motor oil (black diesel) or from used hydraulic fluid?

you can't convert motor oil or hydroloic fluid intobio diesel they and be filtered to burn in diesel engines tho or refined into a true diesel but the term biodiesel means diesel fuel transformed from a biological organism (various forms of cooking oil). motor oil or hydroloic fluid is a hydrocarbom biodiesel is a hydroxide hence motor oil or hydroloic fluid releases co2(carbondioxide) when burned and biodiesel releases h2o (water) when burned. I think your question may have been how do you convert motor oil or hydroloic fluid into a fuel you can burn as a diesel fuel(not biodiesel) answer a lot of people are just filtering the wastoil with a 10 micron filter and lowering the viscosity by mixing with 5 to 10 % diesel or kerosine you have to dilute with a greater percentage during cold weather or in colder climates also you can make a tank heater to preheat the oil so you can burn a higher viscosity mixture hope this helps here are some links you may find useful and informativeHow do I make bio diesel from used motor oil (black diesel) or from used hydraulic fluid?
Happy Motoring! LOL! Report Abuse
How do I make bio diesel from used motor oil (black diesel) or from used hydraulic fluid?
go to www.bluegrassfuel.net. they have all the info one would ever need to answer this question. Report Abuse

Bio-diesel, as the name says, is made of an organic oil extracted from some live thing, usually plants.





The main process is known as transesterification, that is a chemical reaction that transforms a vegetable oil (that some kind of acid) into a hydrocarbon-like structure.





http://en.wikipedia.org/wiki/Biodiesel_production





So, theoretically, you cannot make biodiesel out of something that is not a ';bio'; oil.





However, you can take advantage of the used oil in heating (by burning it), or you can crack it into a smaller hydrocarbon so that you can use it as gasoline, but this process is usually expensive, even though it's ecologically reasonable, because you can take advantage of the used oil.





http://en.wikipedia.org/wiki/Fluid_catalytic_cracking





All in all, if you don't throw it away in your sink, or in the sewers, you are making good use of it, because these fluids are very prone to pollute a huge quantity of water.
You can't, just take it down to the local motor oil recycling station.