SoyCar recommends you filter your oil to at least two microns and remove any water in the oil down to 500ppm (until a drop of oil on a hot plate of 350 degrees does not sputter and only forms small bubbles). Can stored vegetable oil go bad?
Just as regular petroleum should not sit for an extended period, either in your tank or in a storage container, the same applies to SVO/WVO. Vegetable oil should be filtered to at least 5 microns (2 microns is preferred) and dewatered to 500ppm or less (checked using the crackle test). The oil should then be placed in a container with minimal air space in it and sealed. Oil to be stored for some time should be kept as cold as is easily possible, in a basement or cellar should be adequate, and protected from sunlight. If bacterial growth is present commercial biocides designed for diesel fuel should be used. If stored oil develops a smell like paint and/or has lightened in color (indicating a raise in peroxides) it is highly oxidized and should be discarded. When the oil is to be used, it should be pumped from the storage container, through a filter and into the vehicle. Leave a small amount in the bottom of the container and never draw fuel from the bottom, this oil can be poured into
