everybody should study thier used oil and filter because it gives a good indication on how your engines running and if anythings been broken -up
I found thick black sludge that was like mud you'd find in the bottom of a pond ,it had completely filled the filter bowl ,i cleaned it out and its not come back
since then ive found some small metal pieces in the oil ,but nothing in the filter ,I had the sump removed and inspected they found nothing
so next time its due for oil&filter it'll be inspected again if theres more metal debris I'm gonna tear down the engine
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