Do a quick web search under ‘biodiesel’ or talk to biodiesel enthusiasts and you could assume that DIY making of biodiesel is cheap and easy; that it’s environmentally sound; and that all diesel engine cars run beautifully on the fuel.
But dig further and you’ll also find that the home production of biodiesel is potentially very dangerous; that to do it safely can involve costs much higher than they first appear; and that there are major question marks over car manufacturer support for biodiesel fuelled cars.
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(The success of the biodiesel fuel industry relies heavily on biodiesel testing, not only at the production level but at the consumer level, where degraded fuel may cause engine failures. Fleet Biodiesel's family of inexpensive biodiesel test kits is just a click away on the internet)