Verified answer

Vegetable oil can be used as diesel fuel just as it is, without being converted to biodiesel.

The downside is that straight vegetable oil s much more viscous (thicker) than conventional diesel fuel or biodiesel, and it doesn't burn the same in the engine -- many studies have found that it can damage engines.

BUT it can be done properly and safely -- IF you get a professional engine conversion.

There are other approaches, here are the main ones:

1.Just put it in and go.

2.Mix it with diesel fuel or kerosene then just put it in and go.

3.Blend it with an organic solvent additive or with what some companies call "our secret ingredient that we'll tell you about if you pay us" (several versions) or with up to 20% gasoline (petrol), just put it in and go.

4.The only way to use veg-oil is in a properly installed two-tank system where the oil is pre-heated and you start up and shut down on diesel fuel (or biodiesel).

Some references:

"Technical Overview of Vegetable Oil as a Transportation Fuel", 1991, Charles L. Peterson and Dick L. Auld, Department of Agricultural Engineering, University of Idaho -- see section concerning Fuls, South Africa, indirect injection engines: Fuls. J., Hawkins, C.S. and Hugo, F.J.C., 1984, "Tractor Engine Performance on Sunflower Oil Fuel," Journal of Agricultural Engineering Research 30:29-35. Download (Acrobat file, 2152kb):

http://www.biodiesel.org/resources/reportsdatabase...

reports/gen/19910101_gen-292.pdf

Use of Raw Vegetable Oils as Diesel Fuel Replacements -- University of Idaho: "... most research with raw vegetable oils have shown reduced engine life due to polymerization in the ring belt area and in some cases lubricating oil thickening, reduced bearing life or even sudden catastrophic failure..."

http://www.uidaho.edu/bae/biodiesel/rawoils.html

Using Unmodified Vegetable Oils as a Diesel Fuel Extender -- A Literature Review by Sam Jones and Charles L. Peterson, University of Idaho, September 2002: "When tested in long term tests blends above 20 percent nearly always result in engine damage or maintenance problems... many researchers have been involved in testing programs designed to evaluate long term performance characteristics. Results of these studies indicated that potential hazards such as stuck piston rings, carbon buildup on injectors, fuel system failure, and lubricating oil contamination (Pratt, 1980) existed when vegetable oils were used as alternative fuels... Engine tests showed that carbon deposits in the engine were reduced if the oil was heated prior to combustion. It was also noted that carbon deposit levels differed for oils with similar viscosities, indicating that oil composition was also an important factor." 4,600-word report. (Word document, 56kb):

http://www.uidaho.edu/bae/biodiesel/

raw%20vegetable%20oils_literature%20review.doc

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http://journeytoforever.org/biodiesel_make.html