So, any ideas about this wear? I'm thinking that the absence of lead, but the presence of other metals may indicate wear in the turbocharger, instead of the engine. Anyone else care to take a guess? I'm not going to have time to do pressure or compression tests until the weekend, so I'm just looking for ideas right now. I'm not losing any coolant that I can see. I did the timing belt during this OCI, but I don't see how that would affect anything in this regard. The turbo does whine a bit, but I haven't checked for shaft play. My oil consumption during this OCI was about 0.5 quarts.