Used fluids such as engine oil, transmission fluid, anti-freeze and brake fluid are hazardous wastes and must be disposed of properly. Before draining any fluids, consult your local authorities; in many areas, waste oil, etc. is being accepted as a part of recycling programs. An increasing number of service stations and auto parts stores are also accepting waste fluids for recycling.
Be sure of the recycling center's policies before draining fluids, as many will not accept fluids which have been mixed together.