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This engine has variable valve timing so low oil pressure can cause engine performance issues.
The first thing that should be done is use a mechanical gauge to measure the actual oil pressure to see if there is an engine mechanical issue or if it's electrical. You'll want to remove the oil sender and thread a mechanical gauge into the port and check pressure.
With the engine at operating temperature oil pressure should be at least 15 PSI at idle, and at least 67 PSI at 3,000 RPM.
If oil pressure is low then you might try replacing the filter again. It's not unheard of for a bad filter to cause a pressure drop.
If that doesn't help then the problem is either a restricted pump pickup, bad pump, or a bearing wear issue. If you aren't hearing any knocking noises then it's not as likely to be a bearing issue.
Thank you for your reply! Like your "picture" ! Ex-USAF long ago.
Noticed you did not specifically comment on/about the Knox sensor issues that a local car repair place advised me needed replacing. Beyond the OIL issue I am of course concerned about the serious $ required to replace the sensors---and maybe for no reason. If I read and understand your response correctly (?) the effects of low oil pressure will or may cause/create a condition that will activate the Knox sensors....there by effecting the electronics-timing system. Is that correct-??
I think so...based on what the repair shop owner told me that changed the oil pressure sensor. The car was --as noted--running rough especially if in gear with the brakes on. I never heard of them until he mention it. I then educated myself by reading--Looking at the very think detail owners manual.