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I'm 75 years old. When I was 17 years old I used to change my oil on my 64 Plymouth sport fury at 2,500 miles, oil was .50 cents a qt.back then. One of the properties of oil is to clean. I won't let dirty oil circulate in my engines and take a chance on a blockage. I now do it at 4,000/4,500 miles. I use a good quality conventional oil and filter although it's getting harder to find and still do it myself.