If your motor has 160k it would be way smarter to just swap in a low mileage unit. If your gauge is reading correctly then it's most likely due to worn out bearings. I also run 0w40 on all my VQs as it's a better oil than 5w30.
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Creator of the GTR TT Conversion Kit, NA Record Holder (401WHP)
Ecutek Master Tuner (VQ37, VR30, VR38, B58, S55, S58)
BTWTuning
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