Interested in alternative energy? Ever thought of running an old Mercedes diesel on processed waste vegetable oil? Me too! While learning how to do this, I took careful notes and eventually put it all together in a FREE extensively documented and photographed 235-page manual that will walk you through the steps: Biodiesel 101 - An Introductory Guide for Brewing and Using Biodiesel in Arizona . The work is licensed under Creative Commons for your use and redistribution.