text: what is a biodiesel engine car? what are the differencese between a biodiesel engine and a petrol diesel engine. what are the importants of using a biodiesel engine compared to petrol diesel engine. what are the benefits if using a biodiesel engine. in short, there is no real difference between a petroleum diesel vehicle and a biodiesel vehicle  (emphasis on biodiesel, not unprocessed vegetable/animal oils and fats).  you can burn biodiesel in a regular diesel car.**  biodiesel tends to be more solvent than petroluem diesel, so older systems that may have natural rubber components will need to have those replaced with synthetic rubber that won't break down.  biodiesel can be winterized just like petroleum diesel.  biodiesel is a definite benefit over petroluem in the sense that it is renewable.  it is also carbon neutral, meaning that the same amount of carbon dioxide emitted by burning it was absorbed by plants that went into producing it.  it is less toxic than petroleum diesel.  it reduces foreign dependence on oil while stimulating the domestic economy at the same time.  the drawback is that it is still just a little more expensive than petroleum diesel and its manufacturing is still not yet widespread.  **note: due to the manufacturing standards currently in place for biodiesel, many diesel manufacturers will not warranty their engine running any concentration greater than 5% biodiesel (b-5).  so note that running a higher concentration of biodiesel, or straight biodiesel may void your engine warranty.  also, because biodiesel is a solvent, it will clean the fuel system.  so, after the first couple of tankfuls, you will probably need to replace your fuel filter since the biodiesel will loosen up all of the gunk in your fuel tank and it will collect in the filter.