2002 dodge 4.7 Engine sludge

the 98-02 2.7 engines were notorious for locking up due to sludge. just google mopar 2.7 litre engine sludge failure. you'll get a million hits. you might find something on the 4.7. there was an internal defect where water leaked into the crankcase. we had a 2002 concord with 66,000 miles and the 2.7 . after i read all that , we traded it in the very next weekend. 2 weeks later we got an email from the dealer telling us it locked up , even after their techs gave it the green light before the trade.

it could just be condensation in your case