I'm wondering if you have a aftermarket intake on the car?
To me it seems that your silicon and insolubles are still too high which can cause premature wear. A faulty air filter or aftermarket one can cause this. I would suggest to clean or replace the air filters. New filters have been found to be faulty from the manufacturer.
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[B]2009 & 2017 370Z Touring Sport Autos SOLD
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