Check your oil level, keep it filled!
Change your oil, I try for 5K miles.
Mine seems to like penzoil platinum the best, go figure?
I can't say that I am anal enough to log my oil pressure numbers, but it stays between the low and high dots.
This is on my '96 trooper, same as the '97.
I just rolled past 260K miles and its not showing any signs of stopping yet, the stupid thing still has the OE clutch in it!

1987 trooper LS.'94 3.2, SAS,35's , lots of dents and rust. Now, improved, with more dents.
1995 trooper LS. Wife won't let me improve this one.
1996 trooper. I'll need something to modify when the '87 finally rusts away.