On the one hand, the research project updated the calculation basis of the model used by the Federal Environment Agency to calculate waste oil flows, and on the other hand, analyses of waste oils were carried out to examine their reprocessability. Here, suitable waste oils from certain areas of application were identified only in individual cases for waste oils assigned to collection category 2 of the Waste Oil Ordinance. The project also supported the collection and processing of data for reporting to the EU Commission in accordance with the Waste Framework Directive. In the last work package, the future changes of waste oils volumes were estimated. Currently, opposing effects on the waste oil volumes can be seen.