Cooking oil goes rancid after some time if you cook fries in it, but by itself I would think it has a fairly long shelf life. How hot would it get in the roll of coolant?

Goes rancid as it oxidizes using it to cook with hastens that process... I found some time to post again after reading and these guys did use vegtable oil... but they recomend motor oil... I still like the idea of lamp oil and some kind of pump and heat transfer block that isn't plastic to the outside which would increase effectiveness too

I wonder if most submersible pumps motors which were designed for water might have a problem with the oil.

~Cause there's no messin when you bust out the Wessin~