I am a mechanic and I suggest you google 3.7 Chrysler.
I owned a 98 Grand Cherokee 4.0 6 Tuned up twice and a water pump replacement. That was all.
I wish I still owned it. Sold at it with 200,000 miles.
I Own an 04 Dodge 1500 Ram 5.7 Hemi 175,000mi Changed radiator once, thats it.
I OWNED an 09 Liberty 3.7 V6 Valve spring breaking, valve seat sucking, timing chain guide chewing, code throwing POS. I dumped it at 58,000 miles.
I hope they have improved it.
I was a big Chrysler fan even though I have been a Ford tech.
Now I’m looking for another 98 Grand Cherokee to restore.