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AFAIK... An oil ring doesn't "seat" in the same way a compression ring does. First, what kind of oil did you use for break in? Have you changed it yet? When you first started driving it, was it stop and go stuff? Next thing to consider, are the PCV valves new? It is pretty amazing how much oil collects in the plenum over time because of the way the Z PCV system is designed. Until the rings get seated well, you will have a little more blow by than you otherwise would, and it is possible that you are seeing the result of that. If you haven't changed your oil yet, do so, and I am probably not telling you anything you don't already know, but use a straight dino oil, no synthetic or syn blends.
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