How Long Does Motor Oil Stay in the Ground?
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Motor Oil Composition
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Before it's been used, motor oil consists of a complex mix of hydrocarbons that make up 80 to 90 percent of its volume and performance-enhancing additives that make up 10 to 20 percent of its volume. While in use, however, motor oil typically picks up other chemicals and materials found in the engine. Although we have a general idea of what these materials are, the exact composition of used motor oil is not known for sure. For this reason, it is difficult to say exactly how long motor oil subsists in the earth or water systems.
Contaminant Persistence
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It is known that some chemicals found in used motor oil such as heavy metals and other toxic contaminants, tend to persist and accumulate, not break down like many natural substances. For this reason, although the exact amount of time is not known for sure, motor oil contaminants can remain in the ground or water system for a number of years, if not hundreds. These hazardous materials also have been known to find their way into organisms such as fish, as well as cause mutations, birth defects and cancer.
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Oil Dangers and How to Help
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The Tennessee Aquarium has compiled some facts about oil pollution in water that may surprise some people. One gallon of oil, not properly disposed of, can contaminate 1 million gallons of fresh water, enough to supply 50 people with drinking water for a year. Every year, 20 times more oil is dumped into the water than was released during the Valdez oil spill. Gogreenmotors.com also reports that "oil is the largest source of pollution in our nation's waterways."
One of the best ways to help prevent oil persistence is by participating in used motor oil recycling programs. Ask your mechanic if your old oil is recycled after being changed, or visit earth911.com to find an oil recycling center near you.
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- Photo Credit Janet Burgess/sxc.hu
