Had my xj for about 10 months and im still learning. My 98 4.0's oil press. sits at about 40 when driving steady, after its been driven a while the idle pressure runs around the first hash mark or a little above, but it stutters and never really settles down. Also after a drive if i shut it down to open the garage and then start it back up to move in once it catches there is this llittle knock for a second. Tell me im paranoid and/or its a jeep thing and live with it. Id hate to have to replace main bearings alread ( its got 113k on it) Thanks much!