I may spark debate, but that is what is needed to help u solve ur problem.
Z owners I talk to say u need to ensure ur using ester oil or ester based. I switched from whatever stock ester oil Nissan uses to Redline 5w30 which is ester based and I noticed a few more knocks here and there. I plan to try Royal Purple next time I change oil.
If your solve ur problem, oil or not, please post here so we can all learn.
Hope this helps.
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STILLEN G3 || F. I. CF Non-Resonated CBE
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