When you put new bearings in did you repace the oil pump? It sounds like oil regulator issue. I would change oil and filter stay with 10w30. If you replaced pump then get someone with obd port connect and laptop have them read oil pressure from PCM, then you know what sending unit is sending to PCM and what PCM is sending to the gauge. Going to heavier oil will boost idle pressure a lb or 2 but only mask what is happening.
The important issue here is you do have good oil pressure just not what you expected. Going to mechanical gauge will not do anything but cost you money. Its still a mechanical device subject to variations.
The important issue here is you do have good oil pressure just not what you expected. Going to mechanical gauge will not do anything but cost you money. Its still a mechanical device subject to variations.




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