This document reviews the environmental liabilities and life-cycle management issues related to used lubricating oils. It finds that understanding ownership transfer of used oils is critical for any company in this business. Such companies are responsible for training staff and contractors on best practices for managing used oils. They should also audit contractors to ensure proper performance. The document describes hypothetical situations to illustrate potential liabilities at different stages, from advice to disposal. It concludes that companies getting into this business must provide accurate guidance and have a well-documented system for managing environmental issues associated with used oils.