Are you wanting to create a test batch of biodiesel or burn vegetable oil in a second heated tank?
If biodiesel, take the oil from the store and follow the instructions. No other pre-processing is required for the oil to be used in making biodiesel. Read the instructions fully... you are dealing with some hazardous chemicals and need to take proper precautions.
It should burn just fine... not needing any filtration assuming it is virgin oil. The basic idea in burning waste veggie as a fuel is to filter it to at least 10 micron (most go to 5 micron) and get all the water out of it. Down here in the South the temps stay above 70 overnight and well into the 90's during the day so I'm currently burning 50/50 filtered waste veggie/diesel in my main tank and waste veggie in my aux heated tank. Within 10 miles of driving I'm ready to switch over to the straight veggie.
This weekend I forgot to change to the main tank before shutting down. The next morning I was pleasantly surprised to find the truck started with surprisingly little stumble.
If you plan to burn virgin veggie a long time you may want to degum it more than it is degummed at the extraction plant. Whil emost of the plant gums are removed enough remain that it can cause accumulations on the intake valves if yo uuse a lot of it. Waste VO is essentially completely degummed as it is used in fryers.
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