Whether the traffic police will be fined for transporting engine oil should depend on the circumstances. Engine oil belongs to the third category of the 9 categories of dangerous goods, including replaced used engine oil. From the perspective of safety management, it also needs to be stored, transported and destroyed in accordance with relevant regulations. Motor oil is a state monopoly, and private trading and transportation may constitute an illegal business crime. If the circumstances are serious, the person shall be sentenced to fixed-term imprisonment of not more than five years. Units engaged in hazardous waste collection, storage, and disposal operations must obtain a hazardous waste business license.

Article 225 of the Criminal Law of the People's Republic of China and the People's Republic of China: The crime of illegal business operations refers to those who violate national regulations and engage in one of the following illegal business behaviors, disrupting market order, and the circumstances are serious, The offender shall be sentenced to fixed-term imprisonment of not more than five years or criminal detention, and shall also or solely be fined not less than one time but not more than five times the illegal income; if the circumstances are particularly serious, he shall be sentenced to fixed-term imprisonment of not less than five years and shall also be fined not less than one time but not more than five times the illegal income or have his property confiscated. : (1) Operating franchises, monopoly items or other restricted items as stipulated in laws and administrative regulations without permission; (2) Buying and selling import and export licenses, import and export certificates of origin, and other business licenses stipulated in laws and administrative regulations (3) Illegal operations of securities, futures, and insurance businesses without approval from relevant national competent authorities, or illegal activities of fund payment and settlement business; (4) Other illegal business activities that seriously disrupt market order.