Have low oil pressure that is 10 psi at idle and 20 giving throttle, checked with manual gage. Already changed oil pressure sensor and filter. Fresh oil change and filter. Got 190k miles.Motor isn't knocking or making noise like its starving for oil. Figure its either cam bearing, vlom or oil pump. Think the easiest thing I could do is just change vlom and intake gaskets and might get lucky. But before I waste anymore time is there any easy way I can narrow down my problem?Any help would be greatly appreciated.