I have been making biodeisel from WVO for a few years, running a diesel car, a boiler and three tractors. I have used the single stage method to make several thousand litres without a problem. I have recently been offered a significant quantity of animal fat (in Australia Frytol), and while I have plenty of WVO I am reluctant to knock the offer back. I tried a few test batches with it but always seem to come up with an inordinate amount of soap, whatever the NaOH level. Has anyone had success with animal fat? Do any of the other methods, such as acid-base or two stage, give better results with fat? Any help appreciated. James Gillies
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