"This page documents how I run waste vegetable oil (WVO) collected for free from restaurants dumpsters. They are glad to get it collected for free since they usually have to pay for removal in this area. The trick to doing this successfully without shortening your engine life is to run a 2 tank heated setup, and filter and dewater the WVO very well. And this is still an experiment where I won't know if the life was shortened for many years yet since these trucks are rated to last 350k miles before overhaul and this one has 140k after 12 years. Many people have driven >100k miles on VO already. I am an engineer, so I spent lots of time studying the conversion kits sold by many companies, and many online forums, and came up with my own design which I think is more reliable, simpler, and cost far less.This truck from 94-98.5 is one of the best diesel engines to convert to VO since its got a strong mechanical fuel injection pump. It burns cleaner than diesel and the exhaust smells like a BBQ grill."

http://www.xyzworks.com/wvo.htm