Oil causes our cars, lawnmowers, and many other machines working smoothly. However, while this process is going on, impurities such as dirt, metal scrapings, water, or chemicals, can get mixed in, so after a while, the oil no longer performs well. Eventually, this used oil must be replaced with new one in order to do the job as perfectly as it used to.

Used oils can be produced by engine lubrication oil, hydraulic fluids, and gear oils used in cars, bikes, or lawnmowers and it can pollute the environment if it is not recycled or disposed properly. Used oil must be managed properly by local waste management authorities or automotive repair shops to prevent contaminating the environment; otherwise we would face consequences as following:

• Motor oil picks up a variety of hazardous contaminants when used in engines and transmissions. These contaminants include lead, cadmium, chromium, arsenic, dioxins, benzene and polycyclic aromatics. If used motor oil and the contaminants it contains are disposed of inappropriately and released into the environment, they can harm humans, plants, animals, fish and shellfish.
• In water, oil is a visible pollutant, floating as a scum on the surface. This oil scum can stop sunlight and oxygen from getting into the water, affecting fish and water plants. It can kill fish, frogs and other animals that breathe from the water's surface.
• ·         Low temperature burning of used oil can create airborne pollutants that can get into people's lungs and have adverse health effects.

Recycling and re-refining used motor oil is preferable to disposal and can provide great environmental benefits. Recycled used motor oil can be re-refined into new oil, processed into fuel oils, and used as raw materials for the petroleum industry.

Recycling used oil keeps it from polluting soil and water. Motor oil does not wear out—it just gets dirty—so recycling it saves a valuable resource. Less energy is required to produce a gallon of re-refined base stock than a base stock from crude oil.