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Just purchased a used 2007 T & C 3.8 v6. Very pristine inside. You can see it was kept well with 93,000 miles. It was giving a knocking sound when I first crancked it up but as it warms it got quiet. So I decided to do an oil change. I changed the oil filter, all spark plugs and wires. I then added some STP oil a real thick honey like substance. (My mechanic suggested it). The knocking got even more quiet. Then it came back. So after watching a few YouTube videos I learned that I may need to check out the rod bearings which required me to drop the oil pan. My mechanic hesitated to do this and suggested I got a new engine which by the way I cannot afford so he reluctantly went ahead with my suggestion. Just as I suspected there were some slight scratches on a few of the bearings but my mechanic said it's best to change them all. By the way I'm curious are there 6 sets or 3 sets. After successfully doing this I noticed that the noise has gotten considerably more quiet but I can still hear a slight noise. Should I change the knock sensor or did my mechanic's failure to lightly sand down the crank shaft which I suggested cause this noise to still be present? Besides replacing the motor which by the way only has 93,000 miles on it (Quite good for the age) what else can be done to remove this knocking. I cannot afford a new engine at the moment and all the used ones I found has double the mileage or higher like 400,000. What should I do? Suggestions please. Thank you