Originally Posted by downtime!
How is it wasting money if the car gets driven hard and still runs like new? Would it do the same if I changed it less frequently? Maybe. Am I willing to find out? No. Oil changes are very cheap compared to the cost of a new engine.
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Because most likely you would be able run it at least 5k miles before it needs any changing under the same conditions. The idea of 3k mile oil changes was true in the old days. Oil has advanced plenty over the years. Also check out bobistheoilguy.com/
http://www.edmunds.com/car-care/stop...-your-oil.html