He is using vegetable oil (not sure if its waste oil or where he is getting it) what type of filter system is recommended? what about this gelling up in the winter? I am not sure what ratio the ingredients are?
When running straight vegetable oil (used or new and not processed into bio diesel) you need to have a heated tank for the oil and basiclly two fuel systems. You start the truck on diesel and switch to veggie when everything is up to temperature.