What oil are you using? I would say it sounds like the factory screws loosened up somehow. 13 psi is definitely too low but it depends on your oil type. Most vehicles that I do gallery gaskets on end up having atleast 20 PSI with hot oil temps, most being above 25psi.
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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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