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The biggest myth is the often-recommended 3,000-mile / three-month oil change. Unfortunately, there are market forces that have a vested interest in convincing vehicle owners to change their oil more often than necessary. The legal prey of these market forces have become convinced that they are purchasing "cheap insurance" or "peace of mind" by changing their oil more often than necessary. Complicating things is the fact that doing oil changes is one of the few do-it-yourself maintenance tasks that is still within the ability of the backyard mechanic to perform. The 3000 mile oil change interval has been pounded into people's heads for decades. It had a scientific basis when engines used non-multi-weight, non-detergent oil. It no longer has any scientific basis, but it is still being promoted by certain entities, most notably the oil change industry in the United States. This myth is also sometimes known as the "Cheap Insurance Myth."
Synthetic oils withstand higher temperatures before breaking down, and have more base stock and less viscosity modifiers.
The American Petroleum Institute states that more than 1 billion gallons of motor oil are sold each year in the U.S. Of this, about 185 million gallons of used motor oil are disposed of improperly each year – dumped onto the ground, tossed into the trash or poured down the drain, according to the U.S. Environmental Protection Agency.
If you are so concerned, just buy the best oil you can find. Research it, don't fall for all the advertising hype on TV. Find a oil that will flat out tell you how long their oil is good for, there are a few out there, AMSOIL, Mobil 1 Extended Performance. All to often people cut corners where they should never cut corners.
I have never changed my oil before 10,000 miles in over 20 yrs, once a year and unlimited miles.
Last edited by Z15; 06-25-2010 at 10:59 AM.