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There is manufacturing debris in every engine, casting flanges that break loose, metal particles from the scuff-in of of the piston rings on the cylider bores, metal particles from the bedding in of crankshaft and camshaft bearings, etc. You just paid $40k+ on the vehicle of your dreams, and you don't want to scrip on a $50 oil change. I did my first oil change at 1,000. As of 16,000 miles I've just done my fourth oil change - that's a change at 1,000 and changes every 5,000.