Most likely the previous owner ran it low on oil. Another contributing factor on those engines is the characteristic dry start condition. Repeated dry starts have a cumulative effect on bearing wear, and of all the internal components needing oil pressure the rod bearings get the worst of it. I also wouldn't recommend using 5w-20 oil in the 3.8L. I know what the oil fill cap & manual says, but the engine was designed 25 years ago to run on 10w-30. Sneaky Mopar recommends 10w30 on their remanufactured 3.8s.
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'09 JKRU. 4" Teraflex long arm, Teraflex R44 housing, Teraflex / Fox Resis, Poly Performance skids, Nemesis Billy Rockers, Nemesis flares, 37" ATZ P3s on 17" 5x5.5" Trailready HDs, Spyntec hubs, Teraflex BBK, Mopar BBK master/booster, Superior front & Alloy USA rear axle shafts, CTMs, Reids, Synergy drag link & tie rod, WTOR hydro-boosted steering, 5.38s, TF Dual Rate front bar, TF bumpers, Warn Powerplant, Tom Woods shafts, AA xfer case cable, Kilby canister relo, RH4x4 cage.
Last edited by SoK66; 12-04-2015 at 09:02 AM.