Quote:
Originally Posted by Craig
How exactly does one filter out substances that have a smaller molecular size than the oil you are trying to use? 
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You cannot, but heating the oil melts at least the animal fats. Animal fats have been known to slime up an unheated fuel system and so has hydrogenated oil.
I will not use hydrogenated oil, too hard to filter for me
Good filtering should be part of any fuel used.
Remember that burning used vegetable oil is still experimental in an engine designed to run diesel.
Do it your way
Steve