I have ran my '90 F350 idi on veggie oil that i got from different sources. What i did was filter the oil, filter it again and again to get all of the floaters out of it. I actually had a filter system set up that would filter it down to a smaller micron size than the filter on the truck. After that, just dumped it in and ran it straight. But i only did this in the summer when temps were 75 degrees plus or it would coagulate aka thicken up too much to even pump. The truck seemed to like it, only problem i really had was that i would be hungry for wings or fries alot for some odd reason. Hope this helps.
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