Legal analysis: Because oil is flammable, the National Hazardous Waste List stipulates that discarded packages, containers and cleaning sundries containing or directly contaminated with hazardous waste belong to hazardous waste, and the waste code is 900-04 1-49.

Legal basis: Article 77 of the Law of People's Republic of China (PRC) on the Prevention and Control of Environmental Pollution by Solid Waste, hazardous waste containers and packages, as well as facilities and places for collection, storage, transportation, utilization and disposal of hazardous waste, shall be marked with hazardous waste identification marks in accordance with regulations.