Yeah, I always sample mid stream like they say. Oneofthe samples frommy Toyota had anunusually high copper content,but all the other samples before and after were fine. I wondered if my sample timing could have been off, but I don't think it would skew the results that much. I have no idea what could have caused the temporary high copper wear, probably not the piston slap issue I was concerned about. I'll have to send in a sample for the 1kRR this summer and see how it's doing.