It is ok for affiliated enterprises to buy waste oil. According to relevant public information, the state encourages registered waste oil recycling companies to carry out formal recycling and salvage of waste oil for reuse. It is ok for affiliated enterprises to buy waste oil, provided that they have formal waste oil recycling and processing qualifications in the local government. Waste edible oil generally refers to all kinds of inferior oils existing in life, such as recycled edible oil and reused frying oil.