I wish that I got a video of my truck making a knocking sound, but I got it into the shop so fast that I didn't have time to. Last week I was sitting in the driveway making a phone call and the truck was idling for about 20 minutes. After the phone call I heard a knocking sound like a rod knock, but when I revved it up the noise went away. What happens is when the truck is at normal temperature and it idles for about 5 minutes it makes this knocking sound that can be heard on the drivers side of the engine. Only when its warm, and only when its idling. if you take off the noise goes away. I took it in the shop and the shop manager said he did not think it was the engine so he kept looking around for something that would be making that sound. he said it runs too good to be anything like a knock or a bearing. They called me on Thursday and said that it was the purge valve. So I had them do it to the tune of $160.00 and picked it up Thursday afternoon. I got home and let it run and thought I heard it, but thought it could be in my head. I went to a dr. appointment and sat in the parking lot and, you guessed it, knocking sound. I called the dealership and they said bring it in, of course they didn't believe me. When i got there they were all waiting for me. I ended up leaving it again so they could work on it Friday but i haven't heard anything yet. The service manager is still holding firm to its nothing internal but he has no idea. he said you can't hear it from the bottom and it runs too good to be a bad engine. he did say the 3.6 is a great engine and will last a long time as long as you change the oil and not go by the dash for the oil changes because that will take you up to 8 or 9k miles. he recommended sticking to the 4k oil changes, usually I do 5k. I have used Pennzoil Platinum 5w20 and usually the mopar filter. I have used Valvoline full synthetic the last 2 times, but the last time i used a Fram ultra guard filter, which is when i heard the knock. so I went to Walmart and got the mopar filter and put it in. No change, it still knocked. I'm hoping to hear something today, I have 40k miles on it and the engine is warranted to 50k so I want this taken care of ASAP. They did say they would give me back my 160 I paid for the purge valve because that wasn't the problem. I've been more than happy with the truck and i'm considering buying my lease at the end, but not if they don't fix it. I'll pay the extra mileage charge and be done with it.