Has anyone used waste vegetable oil as diesel fuel?

we have used it on a test engine on our shop, after the oil was sent to the lab we had some crazy numbers come back.The oil was high in sodium-high enough to be corrosive.Has anyone used waste vegetable oil as diesel fuel?
There is a whole subculture of people who modify diesel engines to run on used vegetable oil. You can read about one drive across the US on vegetable oil at http://courses.fresno.edu/ken.martens.fr鈥?/a>Has anyone used waste vegetable oil as diesel fuel?
My son has ran his 81 Chevy Luv on McDiesel. You don't convert the vehicle you filter the oil. He said it worked the same as regular diesel except he got hungry for a Mac and fries. It takes special filtration equipment to make it work.
I thought there was some car that ran on the stuff, as it always smelled like french Fries

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