I had this same condition in my 09 Z and is original operating for our VQ37HR engines to be noisy. I was paranoid for some time for nothing thinking I would have no choice but to rebuild or replace my engine. I started using the 5W30 Nissan Ester motor oil and 5W30 Royal Purple motor oil and in turn it quieted the drivetrain a lot try it. Also I went back to using the Genuine Nissan oil filters and the Genuine Nismo oil filter not sure if it helped quiet it down.
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Mr. Clean
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