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I, of course, started out with conventional oil after the rebuild to let the engine "break in" better. I changed that oil at 500 mi, 1,000 mi, 2,500 mi. I switched to Royal Purple after about 5,000 miles. Yes, I noticed a difference with Royal Purple vs. conventional. Now I do about ever 7-8,000 miles. I cannot get Royal Purple by the quart around here anymore, only by the jug. I am switching to Quaker full synth. now.
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