How often should I change my oil?

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Why should I change my oil? Do I really need to change my oil every 3000 miles? Here is discussion on oil change intervals by ex ...
Why should I change my oil? Do I really need to change my oil every 3000 miles? Here is discussion on oil change intervals by experienced ASE Master Technician Ray Whitney. The functions of oil, what type of oil to use and what influences manufacturer intervals.

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