After the first oil change at 1K miles there were noticeable "sparklies" in the paste that the magnet trapped. I attribute that to the break in of all of those metal parts setting themselves in against each other. The 2 changes since have contained hardly anything shiny, but a thin film of black residue forms on the end of the oil filter. About the same consistency as the black film I pull off my drain plugs magnets on the FJR.