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I've done it, off and on, for 30 years. My son uses it now in my old 87 Chevy Suburban with a 6.2 diesel. I don't think he's saving a penny - but he's having fun doing it. I used to just pour used cook-oil through a cheesecloth and then dump it straight into my old Mercedes. Never had a problem - but . . . I never ran more than a 50% mix, I was living in a warm area at the time, and the old Mercedes had an in-line injection pump which could handle a lot more abuse than some modern pumps. There are several issues - and information is easy to get. I suggest you read up on it. Just remember a few things. Waste vegetable oil i.e. WVO - e.g. from a deep fryer is different than using virgin uncooked oil that you select and know exactly what it is i.e. SVO. You go to McDonalds and get a load of used oil, you don't know what it's chemical makeup is. It must be filtered, deacidfied, dewatered, and in most cases preheated to keep it thin enough to use. Also if used 100% it needs to be setup just like an old dual-fuel tractor with two tanks. You start on pump diesel, and then switch over to WVO. You must remember to switch back before shutting down. Bio-fuel at the pump is different in many ways. One important factor is - the vegetable oils are selected for having good qualities as a motor fuel - like soy or canola oil.
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