Mineral oil, synthetic oil, and biogenic oil can all be found in aste oils, which are produced as a byproduct of other processes. Waste oil management is controlled by Waste Oil Ordinance of May 1, 2002, which states that converting waste oils into base oil is the most environmentally friendly option. Lubricants, like engine, gear, hydraulic, machinery oils, and lubricating greases, start with base oil, a mineral oil component.