I googled "cetane rating biodiesel" and found this link: http://www.ext.nodak.edu/extpubs/ageng/machine/ae1240w.htm

Cetane of biodiesel is about 55, WVO about 35-45. When I burn straight vegetable oil, I add a double dose of Diesel Fuel Supplement (DFS) in the white bottle.

__________________
'83 240D with 617.952 and 2.88
'01 VW Beetle TDI
'05 Jeep Liberty CRD
'89 Toyota 4x4, needs 2L-T
'78 280Z with L28ET - 12.86@110
Oil Burner Kartel #35

http://i16.photobucket.com/albums/b1...oD/bioclip.jpg