Guys, have you ever heard of statistical versus practical significance? Even if there was a statistical difference between those values, you'd never be able to show that changing your oil based on those numbers was worth doing every 1000 miles. Don't waste your hard earned money every 1000 miles...there's no evidence that a little extra copper, iron, molybdenum, etc will change your engine's life.
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2013 Cadillac V-Wagon, RIP Z
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