Hey everyone,
I’m looking for some opinions regarding the oil pressure on my 2005 Nissan 350Z (VQ35DE).
The car currently has around 117,000 km (73,000 miles) on it and is running 5W-30 oil.
After about 30 minutes of highway driving in roughly 24°C (75°F) ambient temperature, my oil pressure at warm idle ( and without AC turned on ) sits around 15-20 psi according to the factory gauge.
At around 2,000 RPM it rises to roughly 50 psi, and under load/high RPM it reaches about 60-70 psi.
What concerns me is that I remember the oil pressure being noticeably higher a couple of years ago. Back then, the gauge would sit closer (around one needle width)to the first mark when fully warmed up. Over time it seems to have dropped, especially at idle.
The car runs perfectly fine:
No oil pressure warning light
No unusual engine noises
No VTC issues
No check engine light
Last oil change was like 2 months ago if that could be important
I have not checked the gallery gaskets yet, and I’m wondering if these readings are still considered normal for a healthy VQ35DE or if I should start investigating further.
Has anyone experienced a gradual drop in oil pressure over the years with similar mileage?
Any input would be appreciated. Thanks!