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I can add also that I bought a used centrifuge to spin out particles in the oil we drain. They can be found on Ebay for around $50. I observe the stratification of the result of the spinning in the bottom of the tubes and then remove the residue from the plastic test tube and check it both with...

Easy check for the type of metal is to open up the oil filters and check the media for particles trapped there as well as checking the drained oil by running a magnet in and over the particles. If they adhere to the magnet then they are steel, etc of ferrous origin. If they do not adhere then...