yes, replace oil filter now
Reads like valve is bad, all oil filters have a backflow preventer valve, basically a flap that is pushed open when oil pump is working and then closes when oil pump is off so it holds oil in the main passages for restart
Oil Pressure is the amount of oil NOT being used.
Which is why no oil pressure is bad
And minimal oil pressure, above 6psi, is fine.
Oil pump just provides a flow of oil thru the filter and then into the main oil passages, there is no pressure as far as pump is concerned
As the oil tries to squeeze thru passages and bearing gaps it all won't flow thru, so a Back Pressure builds up at the filter and main oil passage, which is where the oil pressure switch/sender is located.
So oil pressure shows that more than enough oil is being pumped, it all can't be used
High oil pressure is bad, just like high blood pressure.
If oil pressure gets too high then oil can squirt out of bearing gaps which "washes out" the bearing surfaces so they start to wear.
Oil pressure that is too low, under 4psi, can't over come gravity and valve train won't get enough oil so you get ticking noise.