Waste
oil burners? Absolutely YES. We have one in the car club. Works great, except you have to make sure that it only gets
oil, and nothing else. Also, a good filter is a MUST. Some of the brands recommend that you mix the used
oil 50/50 with heating oil. Been using it for at least 10 years.
Do a google on "waste oil burners".
Here is one I found .. interesting read
http://www.wasteoilburners.us/index.htm