How much fresh water can be contaminated by the used oil from one oil?

1,000,000 gallons-the answer is d.used oil from one oil change can contaminate 1 million gallons of fresh water - a years supply for 50 people! Safe recycling of your used motor oil is easy to do: do not spill any oil on the ground. put your used motor oil in a clean plastic container with a tight lid. never store used oil in a container that once held chemicals, food, or beverages. do not mix the oil with anything else, such as antifreeze, solvent, or paint. take used motor oil to a service station or other location that collects used motor oil for recycling.