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The 3,000 mile myth refers to a common belief, particularly in the United States, that all motor vehicles should have their motor oil changed at least every 3,000 miles (4,800 km) to maintain their car engine. Efforts are under way to convince the public that this is not necessary and that people should follow the advice given in their owner's manual rather than the advice of oil-change businesses. With modern oils, most modern cars can go 5,000 to 7,000 miles (8000 to 11000 kilometers) before needing an oil change.
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Source of article : Wikipedia