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It cracks me up when I see people say if you use vegetable oil yer gonna have problems.
I've been using waste vegetable oil (WVO) in a 1995 GMC Suburban since 2005. I just went over 80,000 miles. THe Burb has a 2-tank Greasecar Kit. I'm preping a 2000 Ford F250 and a retired 26-foot U-haul for conversion (both have 7.3 L engines.)
I collect, clean and dry all my own oil. As long as you make sure it is clean & dry, it will make your engine run better, quieter and cleaner than petro diesel!
Personally, I like the Greasecar system, not only because it has run fine for 5 years, but also because I can always get someone in their facility when I call or e-mail.