Plant oils work in diesel engines. Gums tend to
form, but there may be ways to prevent or overcome this drawback.
The sap of the copieba tree has received special attention because much can be obtained simply by slashing the tree.
The main objection to using these oils as motor fuel
is that there are usually more exciting and valuable applications for them.
Because glycerol is a byproduct of making biodiesel, a glut of it is anticipated.
M.McCoy, An unlikely impact: Growth of biodiesel has big implications for
the oleochemical industry, Chem. Engr. News. Feb. 21, 2005