http://www.peachparts.com/shopforum/showthread.php?t=242812

See this review of many manufactures and studies using unmodified (unheated-under 80C) veggie oil as a fuel by John Deere, Bosh, etc.

In a summary every attempt to burn over 10% veggie in diesel engines unmodified (under 80C) resulted in engine failure.

If you are going WVO-I would urge a good two tank system to heat the WVO to 80C+ before switching from diesel. Sadly most all single tank systems are like driving on bald tires. A blowout is not a matter of "IF" just a matter of "When"