funny thing is I have a bone stock Z6 here that looks exactly the same and when I was returning the owner of the local honda dealers car I asked a bunch of the techs there and they say its common on the Z6 to wipe rod 1 and 3 bearings do to a change in the oil journals in the Z6 cranks. If you compare all the D16 cranks side by side they all have 2 oil holes in each rod throw except the Z6 crank.